PHP detection for utf-8 or gb2312 encoding _php tutorial

There are many ways to detect string encoding in PHP, the most common is to use the mb_detect_encoding function directly, but there are more advanced ways to use the ASCII value of the character to judge Oh.

Example 1

The code is as follows

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function Is_utf8 ($STR) { $c = 0; $b = 0; $bits = 0; $len =strlen ($STR); for ($i =0; $i < $len; $i + +) { $c =ord ($str [$i]); if ($c > 128) { if (($c >= 254)) return false; ElseIf ($c >= 252) $bits = 6; ElseIf ($c >= 248) $bits = 5; ElseIf ($c >=) $bits = 4; ElseIf ($c >= 224) $bits = 3; ElseIf ($c >= 192) $bits = 2; else return false; if (($i + $bits) > $len) return false; while ($bits > 1) { $i + +; $b =ord ($str [$i]); if ($b < | | $b > 191) return false; $bits--; } } } return true; }

1. Method 1

The code is as follows	Copy Code
function Mb_is_utf8 ($string) { Return mb_detect_encoding () ($string, ' UTF-8 ') = = = ' UTF-8 ';//New discoveries }

2. Method 2

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function Preg_is_utf8 ($string) { Return Preg_match ('/^.*$/u ', $string) > 0;//preg_match ('/^./u ', $string) }

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