What is the difference between normal pass-by-value and pass-by-reference in php functions?

This article mainly shares with you the difference between ordinary value-passing and reference-passing in PHP functions. We will share with you a combination of text and code. Hope it helps everyone.

• Pass by reference

• Variable, for example foo($a)

• New Statements such as foo(new foobar())

• References returned from functions

• You can pass a variable to a function by reference, In this way, the function can modify the value of its parameters

• The following content can be passed by reference
  

• Normal value passing

  Functions cannot modify the value of variables

<?phpfunction foo(&$var){
    $var++;
}function foo1($var){
    $var++;
}$a = 5;echo $a;echo "<br>";
foo($a);echo $a;echo "<br>";$b = 10;echo $b;echo "<br>";
foo1($b);echo $b;


>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

输出561010

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Detailed explanation of the difference between passing by value and passing by reference in php

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