<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Enable or disable interlace</title>
</head>
<body><div class="manualnavbar" style="text-align: center;">
<div class="prev" style="text-align: left; float: left;"><a href="function.imagegrabwindow.html">imagegrabwindow</a></div>
<div class="next" style="text-align: right; float: right;"><a href="function.imageistruecolor.html">imageistruecolor</a></div>
<div class="up"><a href="ref.image.html">GD and Image Functions</a></div>
<div class="home"><a href="index.html">PHP Manual</a></div>
</div><hr /><div id="function.imageinterlace" class="refentry">
<div class="refnamediv">
<h1 class="refname">imageinterlace</h1>
<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">imageinterlace</span> — <span class="dc-title">Enable or disable interlace</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.imageinterlace-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">int</span> <span class="methodname"><strong>imageinterlace</strong></span>
( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$image</code></span>
[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$interlace</code><span class="initializer"> = 0</span></span>
] )</div>
<p class="para rdfs-comment">
<span class="function"><strong>imageinterlace()</strong></span> turns the interlace bit on or off.
</p>
<p class="para">
If the interlace bit is set and the image is used as a <acronym title="Joint Photographic Experts Group">JPEG</acronym> image,
the image is created as a progressive <acronym title="Joint Photographic Experts Group">JPEG</acronym>.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.imageinterlace-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">
image</code></em></span><dd>
<p class="para">An image resource, returned by one of the image creation functions,
such as <span class="function"><a href="function.imagecreatetruecolor.html" class="function">imagecreatetruecolor()</a></span>.</p></dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">interlace</code></em></span>
<dd>
<p class="para">
If non-zero, the image will be interlaced, else the interlace bit is
turned off.
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.imageinterlace-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns 1 if the interlace bit is set for the image, 0 otherwise.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.imageinterlace-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-3253">
<p><strong>Example #1 Turn on interlacing using <span class="function"><strong>imageinterlace()</strong></span></strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// Create an image instance<br /></span><span style="color: #0000BB">$im </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatefromgif</span><span style="color: #007700">(</span><span style="color: #DD0000">'php.gif'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Enable interlancing<br /></span><span style="color: #0000BB">imageinterlace</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">true</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Save the interlaced image<br /></span><span style="color: #0000BB">imagegif</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #DD0000">'./php_interlaced.gif'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagedestroy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
</div>
</p>
</div>
</div><hr /><div class="manualnavbar" style="text-align: center;">
<div class="prev" style="text-align: left; float: left;"><a href="function.imagegrabwindow.html">imagegrabwindow</a></div>
<div class="next" style="text-align: right; float: right;"><a href="function.imageistruecolor.html">imageistruecolor</a></div>
<div class="up"><a href="ref.image.html">GD and Image Functions</a></div>
<div class="home"><a href="index.html">PHP Manual</a></div>
</div></body></html>
