PHP eval() function
Definition and Usage
The eval() function calculates the string as PHP code.
The string must be valid PHP code and must end with a semicolon.
If the return statement is not called in the code string, it returns NULL. If there is a parsing error in the code, the eval() function returns false.
Syntax
eval(phpcode)
| Parameter | Description |
|---|---|
| phpcode | Required. Specifies the PHP code to be calculated. |
Tips and Notes
Note：The return statement will immediately terminate the calculation of the string.
Note：This function is very useful for storing code in database text fields for future calculations.
Example
<?php
$string = "beautiful";
$time = "winter";
$str = 'This is a $string $time morning!';
echo $str. "<br />";
eval("\$str = \"$str\";");
echo $str;
?>
Output：
This is a $string $time morning! This is a beautiful winter morning!
