几点提高php序运行效率的方法
Release： 2016-06-21 09:06:39
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1、用i+=1代替i=i+1。符合c/c++的习惯，效率还高。
2、尽可能的使用PHP内部函数。自己编写函数之前要详细查阅手册，看有没有相关的函数，否则费力不讨好。
3、能使用单引号字符串尽量使用单引号字符串。单引号字符串的效率要高于双引号字符串。
4、用foreach代替while遍历数组。遍历数组时foreach的效率明显高于while循环，而且不需要调用reset函数。两种遍历方法如下：
reset ($arr);
while (list($key, $value) = each ($arr)) {
echo "Key: $key; Value: $value
n";
}
foreach ($arr as $key => $value) {
echo "Key: $key; Value: $value
n";
}
以上几点均经过笔者的测试，不足之处，请多指正。
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