You want to flip an array's keys and values.
Use array_flip().
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="EN" lang="EN">
<head>
<title>PHP</title>
<meta Name="Author" Content="Hann So">
</head>
<body>
<p>
<?php
$fruits = array('Apples', 'Grapes', 'Bananas', 'Oranges');
print_r($fruits);
$fruits = array_flip($fruits);
echo "<p><b>Use array_flip() to flip the array</b></p>";
print_r($fruits);
echo "<p><b>This is an associated array.</b></p>";
$fruits = array('red'=>'Apples', 'green'=>'Grapes', 'yellow'=>'Bananas', 'orange'=>'Oranges');
print_r($fruits);
$fruits = array_flip($fruits);
echo "<p><b>Flip the associated array.</b></p>";
print_r($fruits);
?>
</p>
</body>
</html>
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