在大写字母上爆炸字符串? [英] Explode a string on upper case characters?

问题描述

我如何根据大写字母将$param字符串分解为$chunks个片段?

Ho can i explode $param string into $chunks pieces based on upper-case characters?

$string = 'setIfUnmodifiedSince';
$method = substr($string, 0, 3);
$param  = substr($string, 3);

// Split $param and implode with '-' separator
$chunks = splitAtUpperCase($param); // Chunks are: 'If', 'Unmodified' and 'Since'
$field  = implode('-', $chunks); // Get If-Unmodified-Since HTTP field name

推荐答案

使用 preg_split() 在[A-Z]上应该执行:

function splitAtUpperCase($s) {
        return preg_split('/(?=[A-Z])/', $s, -1, PREG_SPLIT_NO_EMPTY);
}

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编辑
如果您不需要数组本身，则可以使用连字符(-)将大写字符(除了第一个字符)放在前面:

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EDIT
If you don't need the array itself, you can just preprend uppercase characters (except the first) with a hyphen (-):

preg_replace('/(?<!^)([A-Z])/', '-\\1', $param);

(演示)

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