Example Analysis of PHP Array passing is value passing rather than reference passing

Editor to share with you the PHP array transfer is value transfer rather than reference transfer example analysis, I believe that most people do not know much about it, so share this article for your reference, I hope you will learn a lot after reading this article, let's go to know it!

When the function is called, the PHP array is assigned to the parameter as an argument, which is modified in the function, and the array itself is not affected.

Indicates that the pass in this process is value passing, the array variable is not a reference to the array itself, the PHP array itself exists as a value, and the formal parameter is a copy of the array.

This is very different from some other languages (such as c, Js, etc.), and it's worth noting!

The copy code is as follows:

$arr = array (

'name' = >' corn'

'age' = >' 24'

);

Test_arr ($arr)

Function test_arr ($arr) {

$arr ['name'] =' qqyumidi'

}

Print_r ($arr); / / result: Array ([name] = > corn [age] = > 24)

The Js code is as follows:

The copy code is as follows:

Var arr = new Array ('corn',' 24')

Test_arr (arr)

Function test_arr (arr) {

Arr [0] = 'qqyumidi'

}

Console.log (arr); / / result: ["qqyumidi", "24"]

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