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Complete PHP Misc Reference
Definition and Usage
The eval() function evaluates a string as PHP code.
The string must be valid PHP code and must end with semicolon.
This function returns NULL unless a return statement is called in the code string. Then the value passed to return is returned. If there is a parse error in the code string, eval() returns FALSE.
Syntax
eval(phpcode)
| Parameter | Description |
|---|---|
| phpcode | Required. Specifies the PHP code to be evaluated |
Tips and Notes
Note: A return statement will terminate the evaluation of the string immediately.
Tip: This function can be useful for storing PHP code in a database.
Example
<?php
$string = "beautiful";
$time = "winter";
$str = 'This is a $string $time morning!';
echo $str. "<br />";
eval("\$str = \"$str\";");
echo $str;
?>
$string = "beautiful";
$time = "winter";
$str = 'This is a $string $time morning!';
echo $str. "<br />";
eval("\$str = \"$str\";");
echo $str;
?>
The output of the code above will be:
This is a $string $time morning!
This is a beautiful winter morning!
This is a beautiful winter morning!
Complete PHP Misc Reference
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