PHP - eval

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Metóda - eval

(PHP 4, PHP 5, PHP 7)

Evaulates given PHP code. It's a language construct, not a function.

If an error occurred during the evaluation, the whole script exits.

Tip: The output of the evaulated code can be redirected and saved e.g. in a string.

Procedurálne

• function eval (string $code) : mixed

Parametre

Názov	Dátový typ	Predvolená hodnota	Popis
$code	string		Valid PHP code without the opening or closing tags (<?php ?>).

Mávratovej hodnoty

Vracia: mixed

Returns null if the code sent to eval() doesn't return anything, otherwise returns the value returned by the given code. Since PHP 7 it throws the ParseError exception in case of a parse error.

Príklady

<?php
$number = 42;
$name = "John";
$code = 'echo("My name is $name and I am $number years old.");';

eval("$code");