Why is the === operator in PHP faster than ==?

In the previous article "Let me tell you why require_once() in PHP is not easy to use! 》Introduced to you the reasons why require_once() in PHP is not easy to use. Friends who are interested can read and find out~

Then this article will introduce to you # in PHP Why is the ##=== operator faster than ==? The === and == operators in PHP are comparison operators in PHP. The

===

operator is called which is absolutely equal to , and the == operator is called which is equal to . Syntax example:

$a == $b

, TRUE if $a is equal to $b after type conversion;

$a === $b

, if $a is equal to $b, and the two types are the same, it is TRUE;

If the types of the operands are different, then = = and === will produce different results. In this case, the speed of the operator will vary because == will perform a type conversion and then compare.
If the operands are of the same type, then == and === will produce the same result. In this case, the two operators are almost identical in speed because no type conversion is performed by either operator.
#== operator temporarily converts the data type to see if its value is equal to another operand, while === does not require any type conversion and therefore does less work , which makes it faster than the == operator.

Code example 1:

<?php


var_dump(0 == "a");

// 1 == 1 -> true
var_dump("1" == "01");

// 10 == 10 -> true
var_dump("10" == "1e1");

// 100 == 100 -> true
var_dump(100 == "1e2");


var_dump(0 === "a");

// "1" === "01" -> false
var_dump("1" === "01");

// "10" === "1e1" -> false
var_dump("10" === "1e1");

// 100 == "1e2" -> false
var_dump(100 === "1e2");

switch ("a") {
    case 0:
        echo "第一种情况";
        break;

    case "a":
        echo "第二种情况";
        break;
}

Output:

boolean true
boolean true
boolean true
boolean true
boolean false
boolean false
boolean false
boolean false
第一种情况

Code example 2:

<?php

var_dump(1 == TRUE);

var_dump(0 == FALSE);

var_dump(1 === TRUE);

var_dump(0 === FALSE);

Output:

boolean true
boolean true
boolean false
boolean false

Note: The === operator performs a "type-safe comparison", it will return true only if the two operands have the same type and value, and if only To compare values, use ==.

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