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This article mainly introduces "what is the difference between php === and ==". In daily operation, I believe many people have doubts about the difference between php == and ==. Xiaobian consulted various materials and sorted out simple and easy operation methods. I hope to help you answer the doubts of "what is the difference between php == and =="! Next, please follow the small series to learn together!

Php === and == difference: 1, in PHP === means congruent operator, and == means equal operator;2, if the values on both sides of the equal operator are equal, then return true, and if the values on both sides of the congruent operator are equal but of different types, then return false.

Operating environment: Windows 7 system, PHP7.1 version, DELL G3 computer

What is the difference between php == and ==?

Php == and === usage and difference

In the development of the approach encountered numerical matching problems, then in the matching, encountered the following situation, what do you think the result is?

Surprisingly, the output of the above program is true, which means that 0 and 0dff are equal by default in compilation. This is because the relational operation "==" requires that the data types on both sides of the operator be the same, so the string to the right of the equal sign is coerced to integer 0.

This is also a disadvantage of a range of weakly typed languages. In php "===" is provided to solve this problem.

The output of this program is false.

The full equality operation process is as follows:

1. Determine whether the data types of the two sides of the congruent operator are the same. If not, return false.

2. Determine whether the values of the two sides of the congruent operator are equal. If not, return false.

3. Finally, perform the above 2 steps and operations. Returns the result of the operation with.

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