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This article mainly introduces the case-sensitive example analysis in PHP, which has a certain reference value, and interested friends can refer to it. I hope you will gain a lot after reading this article.

PHP is case sensitive

In PHP, all user-defined functions, classes, and keywords (such as if, else, echo, and so on) are case-insensitive.

In the following example, all three echo statements are legal (equivalent):

Example

In PHP, however, all variables are case-sensitive.

In the following example, only the first statement displays the value of the $color variable (this is because $color, $COLOR, and $coLOR are considered three different variables):

Example

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