php比較兩個字串是否相等，==和strcmp( ) 哪個效率高？
php比較兩個字串是否相等，==和strcmp( ) 哪個效率高？
<code><?php
$time1 = microtime(true);
$a = $b = 'hello,world!';
$i = $j = 100000000;
while($i>0){
$i--;
if($a==$b) ;
}
$time2 = microtime(true);
while($j>0){
$j--;
if(strcmp($a,$b));
}
$time3 = microtime(true);
echo ($time2 - $time1)."\n";
echo ($time3 - $time2);
//result
//$ php demo.php
//1.9449820518494
//7.9897949695587
</code>
肯定是== 效率高，因為運算子比函數呼叫省記憶體。
