Differences between PHP5 and PHP7 regarding get functions

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

In PHP5 and PHP7, when obtaining the function/method name through variables and executing the function/method, there may be differences due to version differences. Inconsistent interpretation strategies prevent the same code from running.

Example

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

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

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

For specific differences, please refer to:

Recommended study: "PHP7 Tutorial"

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