seems_utf8( string $str )
Checks to see if a string is utf8 encoded.
Description Description
NOTE: This function checks for 5-Byte sequences, UTF8 has Bytes Sequences with a maximum length of 4.
Parameters Parameters
- $str
-
(string) (Required) The string to be checked
Return Return
(bool) True if $str fits a UTF-8 model, false otherwise.
Source Source
File: wp-includes/formatting.php
893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 | function seems_utf8( $str ) { mbstring_binary_safe_encoding(); $length = strlen( $str ); reset_mbstring_encoding(); for ( $i = 0; $i < $length; $i++ ) { $c = ord( $str[ $i ] ); if ( $c < 0x80 ) { $n = 0; // 0bbbbbbb } elseif ( ( $c & 0xE0 ) == 0xC0 ) { $n = 1; // 110bbbbb } elseif ( ( $c & 0xF0 ) == 0xE0 ) { $n = 2; // 1110bbbb } elseif ( ( $c & 0xF8 ) == 0xF0 ) { $n = 3; // 11110bbb } elseif ( ( $c & 0xFC ) == 0xF8 ) { $n = 4; // 111110bb } elseif ( ( $c & 0xFE ) == 0xFC ) { $n = 5; // 1111110b } else { return false; // Does not match any model } for ( $j = 0; $j < $n; $j++ ) { // n bytes matching 10bbbbbb follow ? if ( ( ++$i == $length ) || ( ( ord( $str[ $i ] ) & 0xC0 ) != 0x80 ) ) { return false; } } } return true;} |
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Changelog Changelog
| Version | Description |
|---|---|
| 1.2.1 | Introduced. |