The difference between === and == in php

The difference between === and == in php

===Compare the sum of the values ​​of two variables Type; == compares the values ​​of two variables, not the data types.

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.

Note:

= is an assignment, for example:

$a=2;$a=$q; at this time, whether you echo $a or echo $q, it will be output 2

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