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

If a value is passed, if it is a non-object, a copy of the value will be passed. Any changes to this variable will not affect the original value. Passing a reference or object means passing the real memory address. Changes to this variable will affect the original value.

function f1($a) {//传值
  $a = $a + 1;
}
function f2(&$a) {//传引用
  $a = $a + 1;
}
$b = 1;
f1($b); 
echo $b; // 输出 1
$b = 1;
f2($b); 
echo $b; // 输出 2

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