PHP 冷知识

2024-10-08 09:04:54

1，执行Linux命令

<?php

 $a =`ls -a /`;  // execute linux command

echo '<pre>'.$a;

2.为变量起别名

<?php

 $a = 2;

 $b =&$a;  //为$a起别名

 echo $b; //2

$a = 4;

echo $b;//4

unset($a); //

 $b = 6;

 echo $b; //6

3. 数组运算。+， ==， =， !=, <>, !

<?php

 $a = [1,2,3];

 $b = [4,2,3];

 print_r($a+$b);

 print_r($b+$a);

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