1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.7 $ -->
<refentry xml:id="function.is-numeric" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>is_numeric</refname>
<refpurpose>
Finds whether a variable is a number or a numeric string
</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>is_numeric</methodname>
<methodparam><type>mixed</type><parameter>var</parameter></methodparam>
</methodsynopsis>
<para>
Finds whether the given variable is numeric. Numeric strings consist of
optional sign, any number of digits, optional decimal part and optional
exponential part. Thus <literal>+0123.45e6</literal> is a valid numeric
value. Hexadecimal notation (<literal>0xFF</literal>) is allowed too but
only without sign, decimal and exponential part.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>var</parameter></term>
<listitem>
<para>
The variable being evaluated.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns &true; if <parameter>var</parameter> is a number or a numeric
string, &false; otherwise.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>is_numeric</function> examples</title>
<programlisting role="php">
<![CDATA[
<?php
$tests = Array(
"42",
1337,
"1e4",
"not numeric",
Array(),
9.1
);
foreach($tests as $element)
{
if(is_numeric($element))
{
echo "'{$element}' is numeric", PHP_EOL;
}
else
{
echo "'{$element}' is NOT numeric", PHP_EOL;
}
}
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>ctype_digit</function></member>
<member><function>is_bool</function></member>
<member><function>is_null</function></member>
<member><function>is_float</function></member>
<member><function>is_int</function></member>
<member><function>is_string</function></member>
<member><function>is_object</function></member>
<member><function>is_array</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
sgml-omittag:t
sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"../../../../manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
vim600: syn=xml fen fdm=syntax fdl=2 si
vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->
|
