What do the two equal signs mean in php?

In PHP, two equal signs "==" means "equal". It is a comparison operator used to compare whether the expressions or variables on both sides of the equal sign are equal. It only compares values, not types; Returns true if they are equal, false if not.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

In php, two equal signs "= "=" means "equality" and is a comparison operator used to compare whether the expressions or variables on both sides of the equal sign are equal.

Use two equal signs "==" for comparison. Only values ​​are compared, not types.

There is also a triple equal sign "==" in PHP, which means "identity", that is, absolute equality (both values ​​and types are equal); using three equal signs === for comparison, in addition to comparing values, also Compare types.

For example, "42" is a string and 42 is an integer. FALSE is a boolean value and "FALSE" is a string.

<?php
if(42 == "42") {
    echo &#39;1、值相等&#39;;
}
 
echo PHP_EOL; // 换行符
 
if(42 === "42") {
    echo &#39;2、类型相等&#39;;
} else {
    echo &#39;3、类型不相等&#39;;
}
?>

Output:

1、值相等
3、类型不相等

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