php中&&与&有什么区别
第一个：&&是逻辑运算符，代表“并且”也就是常说的 AND。常见的还有如下几个：
!$a Not（逻辑非） TRUE，如果 $a 不为 TRUE。
$a && $b And（逻辑与） TRUE，如果 $a 与 $b 都为 TRUE。
$a || $b Or（逻辑或） TRUE，如果 $a 或 $b 任一为 TRUE。
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第二个：&是位运算符，$c = $a & $b, 将把 $a 和 $b 的二进制位中都为 1 的位设为 1。
如5&3 =>101 & 11 这个是二进制
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