Difference between PHP == and ===

The difference between PHP == and ===

In PHP, "==" and "===" both mean judgment Whether two values ​​are equal, the difference between the two is that "===" compares the values ​​​​and types of two variables, while "==" compares the values ​​​​of two variables without comparing data types. Compared with the latter, the two The former is inspected more strictly.

For example $a = '123';

$b = 123;

$a === $b is false;

$a == $b is true;

In some cases you cannot use ==, you can use ===, for example:

<?php
$a = &#39;abc&#39;;
$b= &#39;a&#39;;
if(strpos($a,$b) === false){
    echo &#39;字符串不包含&#39;;
}else{
    echo &#39;字符串包含&#39;;
}
?>

If you use = =, the output "string does not contain" is inconsistent with the actual situation.

Recommended tutorial: "PHP Tutorial"

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