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PHP extract() Function
Use of extract() function in PHP
PHP extract() function is used to convert an array in to variables. It converts the array keys into variable names and the array values into variable value. It accepts three parameters out of which only one is mandatory and other two are optional. It returns the number of variables extracted from the array on success.
Syntax:
extract($array, $extract_rules, $prefix);
Parameter Values
| Parameter | Description |
|---|---|
| array | This is a required parameter. This parameter defines the array to use. |
| extract_rules | This is an optional parameter. This parameter defines how invalid and colliding names are treated. |
| prefix | This is an optional parameter. This parameter defines the prefix. |
Here is an example of extract() function in PHP:
<html>
<body>
<?php
$array = array("a" => "111","b" => "222", "c" => "333");
extract($array);
echo "$a = $a <br>$b = $b <br>$c = $c";
?>
</body>
</html>
Output:
$a = 111 $b = 222 $c = 333
Example 2:
<html>
<body>
<?php
$a = "000";
$array = array("a" => "111","b" => "222", "c" => "333");
extract($array, EXTR_PREFIX_SAME, "dup");
echo "$a = $a <br>$b = $b <br>$c = $c <br>$dup_a = $dup_a";
?>
</body>
</html>
Output:
$a = 000 $b = 222 $c = 333 $dup_a = 111
Example 3
<?php
extract($_POST);
if(isset($save))
{
echo "<center>";
echo "Your Name : ".$fn."<br>";
echo "Your Last Name : ".$ln."<br>";
echo "Your Email : ".$eid."<br>";
echo "Your Course : ".$course."<br>";
echo "</center>";
}
?>
<html>
<head>
<title>use of extract() in Php</title>
</head>
<body bgcolor="sky color">
<form method="post" >
<table border="1" align="center" bgcolor="green">
<tr>
<td>Enter your first Name</td>
<td><input type="text" name="fn"/></td>
</tr>
<tr>
<td>Enter your Last name</td>
<td><input type="text" name="ln"/></td>
</tr>
<tr>
<td>Enter your Email</td>
<td><input type="email" name="eid"/></td>
</tr>
<tr>
<td>Select Your Course</td>
<td>
<select name="course">
<option>Php</option>
<option>java</option>
<option>Perl</option>
</select>
</td>
</tr>
<tr align="center">
<td colspan="2" >
<input type="submit" value="Display Output" name="save"/></td>
</tr>
</table>
</form>
</body>
</html>
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