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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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