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https://github.com/sigmasternchen/php-doc-en
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- Remove the format documentation from fprintf and link to the
documentation in sprintf. Keeping it in one place is better and the fprintf version was outdated anyway. - The precision specifier works on strings too. Document this and add examples. - Add some basic examples of each type specifier. git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@164698 c90b9560-bf6c-de11-be94-00142212c4b1
This commit is contained in:
Dave Barr
parent
ea09e1e3fc
commit
284476507c
2 changed files with 110 additions and 131 deletions
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@ -1,5 +1,5 @@
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<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.3 $ -->
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<!-- $Revision: 1.4 $ -->
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<refentry id="function.fprintf">
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<refnamediv>
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<refname>fprintf</refname>
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@ -14,111 +14,11 @@
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<methodparam choice="opt"><type>mixed</type><parameter>args</parameter></methodparam>
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</methodsynopsis>
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<simpara>
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Write a string produced according to the formatting string
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<parameter>format</parameter> to the stream resource specified
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by <parameter>handle</parameter>..
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Write a string produced according to <parameter>format</parameter>
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to the stream resource specified by <parameter>handle</parameter>.
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<parameter>format</parameter> is described in the documentation for
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<function>sprintf</function>.
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</simpara>
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<simpara>
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The format string is composed of zero or more directives:
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ordinary characters (excluding <literal>%</literal>) that are
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copied directly to the result, and <emphasis>conversion
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specifications</emphasis>, each of which results in fetching its
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own parameter. This applies to <function>fprintf</function>,
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<function>sprintf</function>, and <function>printf</function>.
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</simpara>
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<para>
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Each conversion specification consists of a percent sign
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(<literal>%</literal>), followed by one or more of these
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elements, in order:
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<orderedlist>
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<listitem>
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<simpara>
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An optional <emphasis>padding specifier</emphasis> that says
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what character will be used for padding the results to the
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right string size. This may be a space character or a
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<literal>0</literal> (zero character). The default is to pad
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with spaces. An alternate padding character can be specified
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by prefixing it with a single quote (<literal>'</literal>).
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See the examples below.
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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An optional <emphasis>alignment specifier</emphasis> that says
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if the result should be left-justified or right-justified.
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The default is right-justified; a <literal>-</literal>
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character here will make it left-justified.
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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An optional number, a <emphasis>width specifier</emphasis>
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that says how many characters (minimum) this conversion should
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result in.
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</simpara>
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</listitem>
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<listitem>
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<simpara>
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An optional <emphasis>precision specifier</emphasis> that says
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how many decimal digits should be displayed for floating-point
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numbers. This option has no effect for other types than
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<type>float</type>. (Another function useful for formatting numbers is
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<function>number_format</function>.)
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</simpara>
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</listitem>
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<listitem>
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<para>
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A <emphasis>type specifier</emphasis> that says what type the
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argument data should be treated as. Possible types:
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<simplelist>
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<member>
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<literal>%</literal> - a literal percent character. No
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argument is required.
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</member>
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<member>
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<literal>b</literal> - the argument is treated as an
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integer, and presented as a binary number.
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</member>
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<member>
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<literal>c</literal> - the argument is treated as an
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integer, and presented as the character with that ASCII
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value.
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</member>
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<member>
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<literal>d</literal> - the argument is treated as an
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integer, and presented as a (signed) decimal number.
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</member>
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<member>
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<literal>u</literal> - the argument is treated as an
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integer, and presented as an unsigned decimal number.
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</member>
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<member>
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<literal>f</literal> - the argument is treated as a
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<type>float</type>, and presented as a floating-point number.
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</member>
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<member>
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<literal>o</literal> - the argument is treated as an
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integer, and presented as an octal number.
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</member>
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<member>
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<literal>s</literal> - the argument is treated as and
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presented as a string.
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</member>
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<member>
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<literal>x</literal> - the argument is treated as an integer
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and presented as a hexadecimal number (with lowercase
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letters).
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</member>
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<member>
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<literal>X</literal> - the argument is treated as an integer
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and presented as a hexadecimal number (with uppercase
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letters).
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</member>
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</simplelist>
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</para>
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</listitem>
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</orderedlist>
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</para>
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<simpara>
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Returns the length of the outputted string.
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</simpara>
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@ -134,26 +34,36 @@
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<title>Examples</title>
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<para>
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<example>
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<title><function>sprintf</function>: zero-padded integers</title>
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<title><function>fprintf</function>: zero-padded integers</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$isodate = sprintf("%04d-%02d-%02d", $year, $month, $day);
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if (!($fp = fopen('date.txt', 'w')))
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return;
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fprintf($fp, "%04d-%02d-%02d", $year, $month, $day);
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// will write the formatted ISO date to date.txt
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?>
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]]>
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</programlisting>
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</example>
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<example>
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<title><function>sprintf</function>: formatting currency</title>
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<title><function>fprintf</function>: formatting currency</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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if (!($fp = fopen('currency.txt', 'w')))
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return;
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$money1 = 68.75;
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$money2 = 54.35;
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$money = $money1 + $money2;
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// echo $money will output "123.1";
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$formatted = sprintf("%01.2f", $money);
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// echo $formatted will output "123.10"
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$len = fprintf($fp, '%01.2f', $money);
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// will write "123.10" to currency.txt
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echo "wrote $len bytes to currency.txt";
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// use the return value of fprintf to determine how many bytes we wrote
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?>
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]]>
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</programlisting>
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@ -1,5 +1,5 @@
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<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.9 $ -->
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<!-- $Revision: 1.10 $ -->
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<!-- splitted from ./en/functions/strings.xml, last change in rev 1.2 -->
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<refentry id="function.sprintf">
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<refnamediv>
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@ -60,9 +60,8 @@
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<simpara>
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An optional <emphasis>precision specifier</emphasis> that says
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how many decimal digits should be displayed for floating-point
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numbers. This option has no effect for other types than
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<type>float</type>. (Another function useful for formatting numbers is
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<function>number_format</function>.)
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numbers. When using this specifier on a string, it acts as a
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cutoff point, setting a maximum character limit to the string.
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</simpara>
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</listitem>
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<listitem>
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@ -191,20 +190,91 @@ printf($format, $num, $location);
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</refsect1>
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<refsect1>
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<title>Examples</title>
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<para>
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<example>
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<title><function>sprintf</function>: zero-padded integers</title>
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<programlisting role="php">
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<example>
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<title><function>printf</function>: various examples</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$n = 43951789;
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$u = -43951789;
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$c = 65; // ASCII 65 is 'A'
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// notice the double %%, this prints a literal '%' character
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printf("%%b = '%b'\n", $n); // binary representation
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printf("%%c = '%c'\n", $c); // print the ascii character, same as chr() function
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printf("%%d = '%d'\n", $n); // standard integer representation
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printf("%%e = '%e'\n", $n); // scientific notation
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printf("%%u = '%u'\n", $n); // unsigned integer representation of a positive integer
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printf("%%u = '%u'\n", $u); // unsigned integer representation of a negative integer
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printf("%%f = '%f'\n", $n); // floating point representation
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printf("%%o = '%o'\n", $n); // octal representation
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printf("%%s = '%s'\n", $n); // string representation
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printf("%%x = '%x'\n", $n); // hexadecimal representation (lower-case)
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printf("%%X = '%X'\n", $n); // hexadecimal representation (upper-case)
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?>
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]]>
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</programlisting>
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<para>
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The printout of this program would be:
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</para>
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<screen>
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<![CDATA[
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%b = '10100111101010011010101101'
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%c = 'A'
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%d = '43951789'
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%e = '4.39518e+7'
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%u = '43951789'
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%u = '4251015507'
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%f = '43951789.000000'
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%o = '247523255'
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%s = '43951789'
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%x = '29ea6ad'
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%X = '29EA6AD'
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]]>
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</screen>
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</example>
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<example>
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<title><function>printf</function>: string specifiers</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$s = 'monkey';
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$t = 'many monkeys';
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printf("[%s]\n", $s); // standard string output
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printf("[%10s]\n", $s); // right-justification with spaces
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printf("[%-10s]\n", $s); // left-justification with spaces
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printf("[%010s]\n", $s); // zero-padding works on strings too
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printf("[%10.10s]\n", $t); // left-justification but with a cutoff of 10 characters
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?>
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]]>
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</programlisting>
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<para>
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The printout of this program would be:
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</para>
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<screen>
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<![CDATA[
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[monkey]
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[ monkey]
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[monkey ]
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[0000monkey]
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[many monke]
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]]>
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</screen>
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</example>
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<example>
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<title><function>sprintf</function>: zero-padded integers</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$isodate = sprintf("%04d-%02d-%02d", $year, $month, $day);
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?>
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]]>
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</programlisting>
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</example>
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<example>
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<title><function>sprintf</function>: formatting currency</title>
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<programlisting role="php">
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</programlisting>
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</example>
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<example>
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<title><function>sprintf</function>: formatting currency</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$money1 = 68.75;
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@ -215,11 +285,11 @@ $formatted = sprintf("%01.2f", $money);
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// echo $formatted will output "123.10"
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?>
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]]>
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</programlisting>
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</example>
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<example>
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<title><function>sprintf</function>: scientific notation</title>
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<programlisting role="php">
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</programlisting>
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</example>
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<example>
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<title><function>sprintf</function>: scientific notation</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$number = 362525200;
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@ -227,9 +297,8 @@ $number = 362525200;
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echo sprintf("%.3e", $number); // outputs 3.63e+8
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?>
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]]>
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</programlisting>
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</example>
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</para>
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</programlisting>
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</example>
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</refsect1>
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</refentry>
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