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The difference between PHP5 and PHP7 in taking array elements as dynamic function names

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]} ().

For specific differences, please refer to:

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