代码 <!doctype html> <html> <head> <meta charset="utf-8"> <title>赋值</title> </head> <body> <?php //值传递 $a=1; $b=$a; $a=2; echo "$a,$b"; //引用传递 $c=5; $d=&$c; $c=10; echo "$c,$d"; ?> </body> </html> 效果 输出 2,110,10