eval() function in PHP

The eval() function evaluates a string as PHP code.

Syntax

eval(code)

Parameters

• code − The PHP code to be evaluated.

Return

The eval() 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.

Example

<?php
   $one = "Demo";
   $two = "text";
   $res = 'This is $one $two!';
   echo $res. "<br>";
   eval("\$res = \"$res\";");
   echo $res;
?>

Output

The following is the output.

This is $one $two!
This is Demo text!