PHP中变量的引用:在一个变量前加上 & ,然后赋值给另一个变量,这就是变量的引用赋值。
"; echo $b; echo " ----------------- "; $b = &$a; //变量的引用 echo $a; echo " "; echo $b; echo " ----------------- "; $b = 40; echo $a; echo " "; echo $b; echo " ----------------- "; ?>
10
20
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10
10
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40
40
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