What do the three equal signs '===' in php mean?

"===" in php means "absolute equal" or "constant equal to". It is a comparison operator of PHP; when using the "===" operator, the two compared If the variable values ​​are equal and the types are the same, the returned result is "true", otherwise "false" is returned, and the syntax is "$x===$y".

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

Three of the php What does the equal sign "===" mean

The three equal signs in PHP mean absolute equality. If x is equal to y and they are of the same type, true is returned. It is a type of PHP comparison operator.

Requires that the given left and right variables must be completely equal. For example, the following one compares strings and integers:

Output result: different data types or values.

===: Complete equal operation, not only compares the value, but also compares the type of the value. It is true only if the two are consistent.

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