驼峰与下划线字符串格式互换

2017-03-05 22:43 Posted in Learn with PHP

开发中经常遇到需要把下划线命名格式的字符串修改为驼峰格式，或者相反。我把它包装成为一个函数，方便转换操作。

方法1：使用正则匹配。

<?php
/*
* @param string $str the string that needs to be transform
* @return depends on input, it'll return either camel-case or under-score string
**/
function str_formator($str)
{
	if (strpos($str, '_'))
	{


		$pattern = '/(?:_)([\w]?)/i';
		$ccstr = preg_replace_callback($pattern, function ($match) {
			return strtoupper($match[1]);
		}, $str);
		
		return $ccstr;
	}
	else
	{
		$pattern = '/([A-Z])/';
		$usstr = preg_replace_callback($pattern, function ($match) {
			return '_' . strtolower($match[1]);
		}, $str);
		
		return $usstr;
	}
}

方法2：使用数组与for循环。

<?php
/*
* @param string $str the string that needs to be transform
* @return depends on input, it'll return either camel-case or under-score string
**/
function str_formator2($str)
{
	if (strpos($str, '_'))
	{
		$arr = explode('_', $str);
		$n = count($arr);
		for ($i = 1; $i < $n; $i++)
		{
			$arr[$i][0] = strtoupper($arr[$i][0]);
		}
		$ccstr = implode('', $arr);

		return $ccstr;
	}
	else
	{
		$n = strlen($str);
		for ($i = 0; $i < $n; $i++)
		{
			$asc = ord($str[$i]);
		
			if ($asc >= 65 && $asc <= 90)
			{
				$lower = chr($asc - 32);
				$str[$i] = '_' . chr();
			}
		}
		
		return $str;
	}
}

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驼峰与下划线字符串格式互换