Introduction to the differences between =, == and === in php

===Compares the values ​​and types of two variables; ==Compares the values ​​of two variables, but does not compare data types.

For example:

$a = '123';
$b = 123;
$a === $b;  //为假
$a == $b;  //为真

= means assignment.

For example:

$a=2;
$a=$q;

At this time, whether you echo $a or echo $q, it will output 2.

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