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added is_finite(), is_infinite(), is_nan()

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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@71676 c90b9560-bf6c-de11-be94-00142212c4b1
This commit is contained in:
Hartmut Holzgraefe 2002-03-02 17:18:14 +00:00
parent 6de506a444
commit 8129004fc3
1 changed files with 61 additions and 1 deletions
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62
functions/math.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.math">
<title>Mathematical Functions</title>
<titleabbrev>Math</titleabbrev>
@ -709,6 +709,66 @@ var_dump(hexdec("a0"));
</refsect1>
</refentry>
<refentry id='function.is-finite'>
<refnamediv>
<refname>is_finite</refname>
<refpurpose>
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>bool</type><methodname>is_finite</methodname>
<methodparam><type>float</type><parameter>val</parameter></methodparam>
</methodsynopsis>
<para>
Returns &true; if <parameter>val</parameter> is a leagal finite
number within the allowed range for a PHP float on this platform.
</para>
</refsect1>
</refentry>
<refentry id='function.is-infinite'>
<refnamediv>
<refname>is_infinite</refname>
<refpurpose>
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>bool</type><methodname>is_infinite</methodname>
<methodparam><type>float</type><parameter>val</parameter></methodparam>
</methodsynopsis>
<para>
Returns &true; if <parameter>val</parameter> is infinite (positive or
negative), like the result of <literal>log(0)</literal> or any value to
big to fit into a float on this platform.
</para>
</refsect1>
</refentry>
<refentry id='function.is-nan'>
<refnamediv>
<refname>is_nan</refname>
<refpurpose>
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>bool</type><methodname>is_nan</methodname>
<methodparam><type>float</type><parameter>val</parameter></methodparam>
</methodsynopsis>
<para>
<para>
Returns &true; if <parameter>val</parameter> is 'not a number',
like the result of <literal>acos(1.01)</literal>.
</para>
</para>
</refsect1>
</refentry>
<refentry id="function.lcg-value">
<refnamediv>
<refname>lcg_value</refname>