hholzgra Sat Mar 2 12:18:15 2002 EDT
Modified files:
/phpdoc/en/functions math.xml
Log:
added is_finite(), is_infinite(), is_nan()
Index: phpdoc/en/functions/math.xml
diff -u phpdoc/en/functions/math.xml:1.71 phpdoc/en/functions/math.xml:1.72
--- phpdoc/en/functions/math.xml:1.71 Sat Feb 2 10:36:02 2002
+++ phpdoc/en/functions/math.xml Sat Mar 2 12:18:14 2002
@@ -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>
@@ -705,6 +705,66 @@
&warn.experimental.func;
<para>
&warn.undocumented.func;
+ </para>
+ </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>
