PHP Eval() Function - W3Schools

Trang chủ » Hàm Eval Trong Php » PHP Eval() Function - W3Schools

Có thể bạn quan tâm

PHP eval() Function

❮ PHP Misc Reference

Example

Evaluate a string as PHP code:

<?php$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!

Definition and Usage

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

The string must be valid PHP code and must end with semicolon.

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.

Syntax

eval(phpcode)

Parameter Values

Parameter Description
phpcode Required. Specifies the PHP code to be evaluated

Technical Details

Return Value: 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.
PHP Version: 4+
❮ PHP Misc Reference ★ +1 Sign in to track progress

Từ khóa » Hàm Eval Trong Php