Shulou(Shulou.com)06/03 Report--

This article introduces the "how to write php Chinese interception function mb_strlen and mb_substr" related knowledge, in the actual case operation process, many people will encounter such a dilemma, then let the editor lead you to learn how to deal with these situations! I hope you can read it carefully and be able to achieve something!

The copy code is as follows:

If (! function_exists ('mb_strlen')) {

Function mb_strlen ($text, $encode) {

If ($encode=='UTF-8') {

Return preg_match_all ('% (?

[\ x09\ x0A\ x0D\ x20 -\ x7e] # ASCII

| | [\ xC2-\ xDF] [\ x80 -\ xBF] # non-overlong 2-byte |

| |\ xE0 [\ xA0-\ xBF] [\ x80 -\ xBF] # excluding overlongs |

| | [\ xE1-\ xEC\ xEE\ xEF] [\ x80 -\ xBF] {2} # straight 3-byte |

| |\ xED [\ x80 -\ x9F] [\ x80 -\ xBF] # excluding surrogates |

| |\ xF0 [\ x90 -\ xBF] [\ x80 -\ xBF] {2} # planes 1-3 |

| | [\ xF1-\ xF3] [\ x80 -\ xBF] {3} # planes 4-15 |

| |\ xF4 [\ x80 -\ x8F] [\ x80 -\ xBF] {2} # plane 16 |

)% xs',$text,$out)

} else {

Return strlen ($text)

}

}

}

/ * from Internet, author unknown * /

If (! function_exists ('mb_substr')) {

Function mb_substr ($str, $start, $len ='', $encoding= "UTF-8") {

$limit = strlen ($str)

For ($s = 0; $start > 0) {/ / found the real start

If ($s > = $limit)

Break

If ($str [$s] = "\ x80" & & $str [$s] 0;-- $len) {/ / found the real end

If ($e > = $limit)

Break

If ($str [$e] = "\ x80" & & $str [$e]

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