PHP中的==和===运算符

问题描述

假设我有一个永远是字符串的变量.

Let's say I have a variable that will always be a string.

现在使用以下代码:

if($myVar === "teststring")

注意:$myVar将始终是字符串，所以我的问题是

Note: $myVar will always be a string, so my questions is

使用===(身份)或==(相等)哪个更快/最好?

Which is quicker/best, using === (indentity) or the == (equality)?

推荐答案

测试身份总是更快，因为PHP不必键入Juggle即可评估比较.但是，我会说速度差异在纳秒级范围内，可以忽略不计.

Testing for identity is always faster, because PHP does not have to Type Juggle to evaluate the comparison. However, I'd say the speed difference is in the realms of nanoseconds and totally neglectable.

相关阅读:

• PHP类型比较表
• 类型变戏法

• PHP type comparison tables
• Type Juggling

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