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Adding that nice version_compare function, with examples

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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@61976 c90b9560-bf6c-de11-be94-00142212c4b1
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Gabor Hojtsy 2001-11-11 12:29:50 +00:00
parent 0f44bdbf60
commit eef467984d
1 changed files with 65 additions and 2 deletions
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67
functions/info.xml
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@ -1,5 +1,5 @@
<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.71 $ -->
<!-- $Revision: 1.72 $ -->
<reference id="ref.info">
<title>PHP options &amp; information</title>
<titleabbrev>PHP options/info</titleabbrev>
@ -1483,7 +1483,8 @@ echo "Current PHP version: ".phpversion();
</example>
</para>
<para>
See also <function>phpinfo</function>,
See also <function>version_compare</function>,
<function>phpinfo</function>,
<function>phpcredits</function>,
<function>php_logo_guid</function>,
<function>zend_version</function>.
@ -1723,6 +1724,68 @@ putenv ("UNIQID=$uniqid");
</refsect1>
</refentry>
<refentry id="function.version-compare">
<refnamediv>
<refname>version_compare</refname>
<refpurpose>Compares two "PHP-standardized" version number strings</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<funcsynopsis>
<funcprototype>
<funcdef>int <function>version_compare</function></funcdef>
<paramdef>string <parameter>version1</parameter></paramdef>
<paramdef>string <parameter>version2</parameter></paramdef>
<paramdef>string
<parameter>
<optional>operator</optional>
</parameter>
</paramdef>
</funcprototype>
</funcsynopsis>
<para>
<function>version_compare</function> compares
two "PHP-standardized" version number strings. This
is useful if you would like to write programs working
only on some versions of PHP.
</para>
<para>
<function>version_compare</function> returns -1 if
the first version is lower than the second, 0 if they
are equal, and +1 if the second is lower.
</para>
<para>
If you specify the third optional
<parameter>operator</parameter> argument, you
can test for a particular relationship. The possible
operators are: <literal>&lt;</literal>,
<literal>lt</literal>, <literal>&lt;=</literal>,
<literal>le</literal>, <literal>&gt;</literal>,
<literal>gt</literal>, <literal>&gt;=</literal>,
<literal>ge</literal>, <literal>==</literal>,
<literal>=</literal>, <literal>eq</literal>,
<literal>!=</literal>, <literal>&lt;&gt;</literal>,
<literal>ne</literal> respectively. Using
this argument, the function will return 1 if
the realtionship is the one specified by the
operator, 0 otherwise.
</para>
<para>
<example>
<title><function>version_compare</function> example</title>
<programlisting role="php">
// prints -1
echo version_compare("4.0.4", "4.0.6");
// the all print 1
echo version_compare("4.0.4", "4.0.6", "&lt;");
echo version_compare("4.0.6", "4.0.6", "eq");
</programlisting>
</example>
</para>
</refsect1>
</refentry>
<refentry id="function.zend-logo-guid">
<refnamediv>
<refname>zend_logo_guid</refname>