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<title>Remove a portion of the array and replace it with something else</title>
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<div class="refnamediv">
<h1 class="refname">array_splice</h1>
<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">array_splice</span> — <span class="dc-title">Remove a portion of the array and replace it with something else</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.array-splice-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">array</span> <span class="methodname"><strong>array_splice</strong></span>
( <span class="methodparam"><span class="type">array</span> <code class="parameter reference">&$input</code></span>
, <span class="methodparam"><span class="type">int</span> <code class="parameter">$offset</code></span>
[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$length</code><span class="initializer"> = count($input)</span></span>
[, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$replacement</code><span class="initializer"> = array()</span></span>
]] )</div>
<p class="para rdfs-comment">
Removes the elements designated by <code class="parameter">offset</code> and
<code class="parameter">length</code> from the <code class="parameter">input</code> array,
and replaces them with the elements of the
<code class="parameter">replacement</code> array, if supplied.
</p>
<p class="para">
Note that numeric keys in <code class="parameter">input</code> are not preserved.
</p>
<blockquote class="note"><p><strong class="note">Note</strong>:
<span class="simpara">
If <code class="parameter">replacement</code> is not an array, it will be
<a href="language.types.array.html#language.types.array.casting" class="link">typecast</a>
to one (i.e. <code class="code">(array) $replacement</code>). This may result in unexpected
behavior when using an object or <strong><code>NULL</code></strong> <code class="parameter">replacement</code>.
</span>
</p></blockquote>
</div>
<div class="refsect1 parameters" id="refsect1-function.array-splice-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<code class="parameter">input</code></dt>
<dd>
<p class="para">
The input array.
</p>
</dd>
<dt>
<code class="parameter">offset</code></dt>
<dd>
<p class="para">
If <code class="parameter">offset</code> is positive then the start of removed
portion is at that offset from the beginning of the
<code class="parameter">input</code> array. If <code class="parameter">offset</code>
is negative then it starts that far from the end of the
<code class="parameter">input</code> array.
</p>
</dd>
<dt>
<code class="parameter">length</code></dt>
<dd>
<p class="para">
If <code class="parameter">length</code> is omitted, removes everything
from <code class="parameter">offset</code> to the end of the array. If
<code class="parameter">length</code> is specified and is positive, then
that many elements will be removed. If
<code class="parameter">length</code> is specified and is negative then
the end of the removed portion will be that many elements from
the end of the array. If <code class="parameter">length</code> is
specified and is zero, no elements will be removed.
Tip: to remove everything from
<code class="parameter">offset</code> to the end of the array when
<code class="parameter">replacement</code> is also specified, use
<em>count($input)</em> for
<code class="parameter">length</code>.
</p>
</dd>
<dt>
<code class="parameter">replacement</code></dt>
<dd>
<p class="para">
If <code class="parameter">replacement</code> array is specified, then the
removed elements are replaced with elements from this array.
</p>
<p class="para">
If <code class="parameter">offset</code> and <code class="parameter">length</code>
are such that nothing is removed, then the elements from the
<code class="parameter">replacement</code> array are inserted in the place
specified by the <code class="parameter">offset</code>. Note that keys in
replacement array are not preserved.
</p>
<p class="para">
If <code class="parameter">replacement</code> is just one element it is
not necessary to put <em>array()</em>
around it, unless the element is an array itself, an object or <strong><code>NULL</code></strong>.
</p>
</dd>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.array-splice-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns an array consisting of the extracted elements.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.array-splice-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-6199">
<p><strong>Example #1 <span class="function"><strong>array_splice()</strong></span> examples</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$input </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"red"</span><span style="color: #007700">, </span><span style="color: #DD0000">"green"</span><span style="color: #007700">, </span><span style="color: #DD0000">"blue"</span><span style="color: #007700">, </span><span style="color: #DD0000">"yellow"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">array_splice</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">// $input is now array("red", "green")<br /><br /></span><span style="color: #0000BB">$input </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"red"</span><span style="color: #007700">, </span><span style="color: #DD0000">"green"</span><span style="color: #007700">, </span><span style="color: #DD0000">"blue"</span><span style="color: #007700">, </span><span style="color: #DD0000">"yellow"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">array_splice</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, -</span><span style="color: #0000BB">1</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">// $input is now array("red", "yellow")<br /><br /></span><span style="color: #0000BB">$input </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"red"</span><span style="color: #007700">, </span><span style="color: #DD0000">"green"</span><span style="color: #007700">, </span><span style="color: #DD0000">"blue"</span><span style="color: #007700">, </span><span style="color: #DD0000">"yellow"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">array_splice</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">count</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">), </span><span style="color: #DD0000">"orange"</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">// $input is now array("red", "orange")<br /><br /></span><span style="color: #0000BB">$input </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"red"</span><span style="color: #007700">, </span><span style="color: #DD0000">"green"</span><span style="color: #007700">, </span><span style="color: #DD0000">"blue"</span><span style="color: #007700">, </span><span style="color: #DD0000">"yellow"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">array_splice</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, -</span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, array(</span><span style="color: #DD0000">"black"</span><span style="color: #007700">, </span><span style="color: #DD0000">"maroon"</span><span style="color: #007700">));<br /></span><span style="color: #FF8000">// $input is now array("red", "green",<br />// "blue", "black", "maroon")<br /><br /></span><span style="color: #0000BB">$input </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"red"</span><span style="color: #007700">, </span><span style="color: #DD0000">"green"</span><span style="color: #007700">, </span><span style="color: #DD0000">"blue"</span><span style="color: #007700">, </span><span style="color: #DD0000">"yellow"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">array_splice</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #DD0000">"purple"</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">// $input is now array("red", "green",<br />// "blue", "purple", "yellow");<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
</div>
</p>
<p class="para">
<div class="example" id="example-6200">
<p><strong>Example #2 <span class="function"><strong>array_splice()</strong></span> examples</strong></p>
<div class="example-contents"><p>
The following statements change the values of <var class="varname"><var class="varname">$input</var></var>
the same way:
</p></div>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /><br /></span><span style="color: #FF8000">// append two elements to $input<br /></span><span style="color: #0000BB">array_push</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">$x</span><span style="color: #007700">, </span><span style="color: #0000BB">$y</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">array_splice</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">count</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">), </span><span style="color: #0000BB">0</span><span style="color: #007700">, array(</span><span style="color: #0000BB">$x</span><span style="color: #007700">, </span><span style="color: #0000BB">$y</span><span style="color: #007700">));<br /><br /></span><span style="color: #FF8000">// remove the last element of $input<br /></span><span style="color: #0000BB">array_pop</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">array_splice</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, -</span><span style="color: #0000BB">1</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// remove the first element of $input<br /></span><span style="color: #0000BB">array_shift</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">array_splice</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// insert an element at the start of $input<br /></span><span style="color: #0000BB">array_unshift</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">$x</span><span style="color: #007700">, </span><span style="color: #0000BB">$y</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">array_splice</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, array(</span><span style="color: #0000BB">$x</span><span style="color: #007700">, </span><span style="color: #0000BB">$y</span><span style="color: #007700">));<br /><br /></span><span style="color: #FF8000">// replace the value in $input at index $x<br /></span><span style="color: #0000BB">$input</span><span style="color: #007700">[</span><span style="color: #0000BB">$x</span><span style="color: #007700">] = </span><span style="color: #0000BB">$y</span><span style="color: #007700">; </span><span style="color: #FF8000">// for arrays where key equals offset<br /></span><span style="color: #0000BB">array_splice</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">$x</span><span style="color: #007700">, </span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">$y</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
</div>
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.array-splice-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"><span class="function"><a href="function.array-slice.html" class="function" rel="rdfs-seeAlso">array_slice()</a> - Extract a slice of the array</span></li>
<li class="member"><span class="function"><a href="function.unset.html" class="function" rel="rdfs-seeAlso">unset()</a> - Unset a given variable</span></li>
<li class="member"><span class="function"><a href="function.array-merge.html" class="function" rel="rdfs-seeAlso">array_merge()</a> - Merge one or more arrays</span></li>
</ul>
</p>
</div>
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