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Xiaobian to share with you how to use eval in php, I hope you have gained something after reading this article, let's discuss it together!

The php eval function evaluates strings according to PHP code using syntax such as "eval(phpcode)", where the parameter phpcode is the PHP code specified to be evaluated.

Operating environment: Windows 7 system, PHP7.1, Dell G3 computer.

PHP eval() function

The eval() function evaluates strings as PHP code.

The string must be legal PHP code and must end with a semicolon.

Returns NULL if the return statement is not called in the code string. If there is a parsing error in the code, the eval() function returns false.

syntax

eval(phpcode)

parameters

Phpcode is required. Specify PHP code to evaluate.

Tips and comments

Note: The return statement immediately terminates the evaluation of the string.

Note: This function is useful for storing code in database text fields for later calculations.

example

Output:

This is a $string $time morning! This is a beautiful winter morning!

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