php中比较两个字符串是否相等，==和strcmp( ) 哪个效率高？

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肯定是== 效率高，因为运算符比函数调用省内存。

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我觉得吧，还是要自己多多实践。

<?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