PHP 测试杂项

// 驼峰转下划线
function humpToUnderline($str){
    if(empty($str)){
        return "";
    }
    $arr = str_split($str);
    $temp = "";
    foreach($arr as $key => $val){
        $ascii = ord($val);
        if( $ascii >= 65 && $ascii <= 90 ){
            if($key == 0){
                $temp .= chr($ascii+(97-65));
            }else{
                $temp .= "_".chr($ascii+(97-65));
            }
        }else if( $ascii >= 97 && $ascii <= 122 ){
            $temp .= chr($ascii);
        }else{
            $temp .= "";
        }
    }
    return $temp;
}
// 下划线转驼峰
function underlineToHump($str){
    if(empty($str)){
        return "";
    }
    $arr = explode("_", $str);
    foreach($arr as $key => $val){
        $arr[$key] = ucfirst( strtolower($val) );
    }
    return implode("",$arr);
    // return implode("",array_map('ucfirst',array_map('strtolower',explode("_", $str))));
}

// ASCII A - 65
// ASCII Z - 90
// ASCII a - 97
// ASCII z - 122
$str = "ABC";
echo humpToUnderline($str);
echo "<br>";
$str = "a_b_____c";
echo underlineToHump($str);
exit;
preg_match_all("/([A-Z]{1}).*[A-Z]*/", $str, $matches);

// foreach($matches[1] as $key => $val){
//     echo strpos($str,$val)."/";
// }

var_dump($matches);
// $str = "AaBbCc";
// preg_match_all("/([A-Z]{1})(.)/", $str, $matches);
// $matches[0] 匹配全体字符串
// $matches[1] 匹配第一个括号里面字符串
// $matches[2] 匹配第二个括号里面字符串
if(count($matches[1]) > 0){
    $res = array_map(function($v){
        return "_".strtolower($v);
    }, $matches[0]);
}
$res = ltrim( implode("", $res),"_" );
var_dump($res);

// $str = preg_replace('/([A-Z]{1})/',"strtoupper('$1')",$str);

详解 $_SERVER 函数中QUERY_STRING和REQUEST_URI区别

实例：

1，http://localhost/aaa/ (打开aaa中的index.php)
结果：
$_SERVER['QUERY_STRING'] = "";
$_SERVER['REQUEST_URI']  = "/aaa/";
$_SERVER['SCRIPT_NAME']  = "/aaa/index.php";
$_SERVER['PHP_SELF']     = "/aaa/index.php";

2，http://localhost/aaa/?p=222 (附带查询)
结果：
$_SERVER['QUERY_STRING'] = "p=222";
$_SERVER['REQUEST_URI']  = "/aaa/?p=222";
$_SERVER['SCRIPT_NAME']  = "/aaa/index.php";
$_SERVER['PHP_SELF']     = "/aaa/index.php";

3，http://localhost/aaa/index.php?p=222&q=333
结果：
$_SERVER['QUERY_STRING'] = "p=222&q=333";
$_SERVER['REQUEST_URI']  = "/aaa/index.php?p=222&q=333";
$_SERVER['SCRIPT_NAME']  = "/aaa/index.php";
$_SERVER['PHP_SELF']     = "/aaa/index.php";

由实例可知：
$_SERVER["QUERY_STRING"]  获取查询 语句，实例中可知，获取的是?后面的值
$_SERVER["REQUEST_URI"]   获取 http://localhost 后面的值，包括/
$_SERVER["SCRIPT_NAME"]   获取当前脚本的路径，如：index.php
$_SERVER["PHP_SELF"]      当前正在执行脚本的文件名