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<title>References all variables available in global scope</title>
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<h1 class="refname">$GLOBALS</h1>
<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">$GLOBALS</span> — <span class="dc-title">References all variables available in global scope</span></p>
</div>
<div class="refsect1 description" id="refsect1-reserved.variables.globals-description">
<h3 class="title">Description</h3>
<p class="para">
An associative <span class="type"><a href="language.types.array.html" class="type array">array</a></span> containing references to all variables which
are currently defined in the global scope of the script. The
variable names are the keys of the array.
</p>
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<div class="refsect1 examples" id="refsect1-reserved.variables.globals-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="variable.globals.basic">
<p><strong>Example #1 <var class="varname"><var class="varname">$GLOBALS</var></var> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">test</span><span style="color: #007700">() {<br /> </span><span style="color: #0000BB">$foo </span><span style="color: #007700">= </span><span style="color: #DD0000">"local variable"</span><span style="color: #007700">;<br /><br /> echo </span><span style="color: #DD0000">'$foo in global scope: ' </span><span style="color: #007700">. </span><span style="color: #0000BB">$GLOBALS</span><span style="color: #007700">[</span><span style="color: #DD0000">"foo"</span><span style="color: #007700">] . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /> echo </span><span style="color: #DD0000">'$foo in current scope: ' </span><span style="color: #007700">. </span><span style="color: #0000BB">$foo </span><span style="color: #007700">. </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />}<br /><br /></span><span style="color: #0000BB">$foo </span><span style="color: #007700">= </span><span style="color: #DD0000">"Example content"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">test</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
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<div class="example-contents"><p>The above example will output
something similar to:</p></div>
<div class="example-contents screen">
<div class="cdata"><pre>
$foo in global scope: Example content
$foo in current scope: local variable
</pre></div>
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</p>
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<div class="refsect1 notes" id="refsect1-reserved.variables.globals-notes">
<h3 class="title">Notes</h3>
<blockquote class="note"><p><strong class="note">Note</strong>: <p class="para">This is a 'superglobal', or
automatic global, variable. This simply means that it is available in
all scopes throughout a script. There is no need to do
<strong class="command">global $variable;</strong> to access it within functions or methods.
</p></p></blockquote>
<blockquote class="note"><p><strong class="note">Note</strong>:
<strong>Variable availability</strong><br />
<p class="para">
Unlike all of the other <a href="language.variables.superglobals.html" class="link">superglobals</a>,
<var class="varname"><var class="varname">$GLOBALS</var></var> has essentially always been available in PHP.
</p>
</p></blockquote>
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