Home Backend Development PHP Tutorial 【求赐教】为什么PHP的这2个加法运算结果为什么都是3

【求赐教】为什么PHP的这2个加法运算结果为什么都是3

Jun 13, 2016 am 11:38 AM
dump nbsp php undefined

【求指教】为什么PHP的这2个加法运算结果为什么都是3?

<?php <br />$a = 1;<br />$c = $a+$a++;<br />var_dump($c); // result:3<br /><br />$a = 1;<br />$c = $a+$a+$a++;<br />var_dump($c); //result:3
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我的理解:第一个结果应该是2,第二个结果应该是3
打印输出:
int 3<br />int 3
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