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This article mainly explains "what are the differences between PHP5 and PHP7 about obtaining functions". The explanation in this article is simple and clear, easy to learn and understand. Please follow Xiaobian's train of thought to study and learn "what are the differences between PHP5 and PHP7 about obtaining functions"?

When you execute a function / method by getting the function / method name through variables in PHP5 and PHP7, the same code may not run because of the interpretation policy that does not agree between versions.

Example

$a = ['add',' sub']; class Test {public function add () {echo 1 + 2;}} $t = new Test (); $t-> $a [0] ()

The above example works normally under PHP5.6, but throws Fatal error: Function name must be a string under PHP7. This is because when t-> t − > a0 is executed under PHP5, $a [0] is executed first, the value of the element is obtained, and then the specific method of the object is executed.

Under PHP7, t-> t − > a will be executed first, causing an error to be thrown and interrupting execution. If you need to execute normally under PHP7, you need to change it to t-> {a [0]} ().

Thank you for your reading, the above is "what is the difference between PHP5 and PHP7 about the access function", after the study of this article, I believe you have a deeper understanding of the difference between PHP5 and PHP7 on the acquisition function, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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