Source of: /manual/en/function.is-bool.php
<?php
include_once $_SERVER['DOCUMENT_ROOT'] . '/include/shared-manual.inc';
$TOC = array();
$PARENTS = array();
include_once dirname(__FILE__) ."/toc/ref.var.inc";
$setup = array (
'home' =>
array (
0 => 'index.php',
1 => 'PHP Manual',
),
'head' =>
array (
0 => 'UTF-8',
1 => 'en',
),
'this' =>
array (
0 => 'function.is-bool.php',
1 => 'is_bool',
),
'up' =>
array (
0 => 'ref.var.php',
1 => 'Variable handling Functions',
),
'prev' =>
array (
0 => 'function.is-binary.php',
1 => 'is_binary',
),
'next' =>
array (
0 => 'function.is-buffer.php',
1 => 'is_buffer',
),
);
$setup["toc"] = $TOC;
$setup["parents"] = $PARENTS;
manual_setup($setup);
manual_header();
?>
<div id="function.is-bool" class="refentry">
<div class="refnamediv">
<h1 class="refname">is_bool</h1>
<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">is_bool</span> — <span class="dc-title">
Finds out whether a variable is a boolean
</span></p>
</div>
<a name="function.is-bool.description"></a><div class="refsect1 description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">bool</span> <span class="methodname"><b>is_bool</b></span>
( <span class="methodparam"><span class="type"><a href="language.pseudo-types.php#language.types.mixed" class="type mixed">mixed</a></span> <tt class="parameter">$var</tt></span>
)</div>
<p class="para rdfs-comment">
Finds whether the given variable is a boolean.
</p>
</div>
<a name="function.is-bool.parameters"></a><div class="refsect1 parameters">
<h3 class="title">Parameters</h3>
<p class="para">
</p><dl>
<dt class="varlistentry">
<span class="term"><i><tt class="parameter">var</tt></i>
</span>
</dt><dd class="listitem">
<p class="para">
The variable being evaluated.
</p>
</dd>
</dl>
<p>
</p>
</div>
<a name="function.is-bool.returnvalues"></a><div class="refsect1 returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns <b><tt class="constant">TRUE</tt></b> if <i><tt class="parameter">var</tt></i>
is a <a href="language.types.boolean.php" class="type boolean">boolean</a>,
<b><tt class="constant">FALSE</tt></b> otherwise.
</p>
</div>
<a name="function.is-bool.examples"></a><div class="refsect1 examples">
<h3 class="title">Examples</h3>
<p class="para">
</p><div class="example">
<p><b>Example #1 <b>is_bool()</b> examples</b></p>
<div class="example-contents programlisting">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$a </span><span style="color: #007700">= </span><span style="color: #0000BB">false</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$b </span><span style="color: #007700">= </span><span style="color: #0000BB">0</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// Since $a is a boolean, this is true<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">is_bool</span><span style="color: #007700">(</span><span style="color: #0000BB">$a</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"Yes, this is a boolean"</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #FF8000">// Since $b is not a boolean, this is not true<br /></span><span style="color: #007700">if (</span><span style="color: #0000BB">is_bool</span><span style="color: #007700">(</span><span style="color: #0000BB">$b</span><span style="color: #007700">)) {<br /> echo </span><span style="color: #DD0000">"Yes, this is a boolean"</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
</div><p>
</p>
</div>
<a name="function.is-bool.seealso"></a><div class="refsect1 seealso">
<h3 class="title">See Also</h3>
<p class="para">
</p><ul class="simplelist">
<li class="member"><a href="function.is-float.php" class="function" rel="rdfs-seeAlso">is_float()</a> - Finds whether the type of a variable is float</li>
<li class="member"><a href="function.is-int.php" class="function" rel="rdfs-seeAlso">is_int()</a> - Find whether the type of a variable is integer</li>
<li class="member"><a href="function.is-string.php" class="function" rel="rdfs-seeAlso">is_string()</a> - Find whether the type of a variable is string</li>
<li class="member"><a href="function.is-object.php" class="function" rel="rdfs-seeAlso">is_object()</a> - Finds whether a variable is an object</li>
<li class="member"><a href="function.is-array.php" class="function" rel="rdfs-seeAlso">is_array()</a> - Finds whether a variable is an array</li>
</ul><p>
</p>
</div>
</div><?php manual_footer(); ?>
