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<?php echo 'Trim blank character' . "\n"; var_dump(trim('   f   ')); echo "\n\nTrim blank character via chrs function \n"; var_dump(trim_blank_chrs('   f   ')); echo "\n\nTrim normal space \n"; var_dump(trim(' f ')); /** * More robust version of PHP's trim() function. It includes a list of UTF-8 blank characters * from http://kb.mozillazine.org/Network.IDN.blacklist_chars * * @param string $string The string to trim from * @param string $charlist Optional. The stripped characters can also be specified using the charlist parameter * @return string The trimmed string */ function trim_blank_chrs($string, $charlist="") { $hex_chrs = array( 0x09 => 1, // \x{0009} 0x0A => 1, // \x{000A} 0x0B => 1, // \x{000B} 0x0D => 1, // \x{000D} 0x20 => 1, // \x{0020} 0xC2 => array(0x81 => 1, 0x8D => 1, 0x90 => 1, 0x9D => 1, 0xA0 => 1, 0xAD => 1), // \x{0081}, \x{008D}, \x{0090}, \x{009D}, \x{00A0}, \x{00AD} 0xCC => array(0xB7 => 1, 0xB8 => 1), // \x{0337}, \x{0338} 0xE1 => array(0x85 => array(0x9F => 1, 0xA0 => 1), 0x9A => array(0x80 => 1), 0xA0 => array(0x8E => 1)), // \x{115F}, \x{1160}, \x{1680}, \x{180E} 0xE2 => array(0x80 => array(0x80 => 1, 0x81 => 1, 0x82 => 1, 0x83 => 1, 0x84 => 1, 0x85 => 1, 0x86 => 1, 0x87 => 1, 0x88 => 1, 0x89 => 1, 0x8A => 1, 0x8B => 1, 0x8C => 1, 0x8D => 1, 0x8E => 1, 0x8F => 1, // \x{2000} - \x{200F} 0xA8 => 1, 0xA9 => 1, 0xAA => 1, 0xAB => 1, 0xAC => 1, 0xAD => 1, 0xAE => 1, 0xAF => 1), // \x{2028} - \x{202F} 0x81 => array(0x9F => 1)), // \x{205F} 0xE3 => array(0x80 => array(0x80 => 1), // \x{3000} 0x85 => array(0xA4 => 1)), // \x{3164} 0xEF => array(0xBB => array(0xBF => 1), // \x{FEFF} 0xBE => array(0xA0 => 1), // \x{FFA0} 0xBF => array(0xB9 => 1, 0xBA => 1, 0xBB => 1)), // \x{FFF9} - \x{FFFB} ); $hex_chrs_rev = array( 0x09 => 1, // \x{0009} 0x0A => 1, // \x{000A} 0x0B => 1, // \x{000B} 0x0D => 1, // \x{000D} 0x20 => 1, // \x{0020} 0x81 => array(0xC2 => 1, 0x80 => array(0xE2 => 1)), // \x{0081}, \x{2001} 0x8D => array(0xC2 => 1, 0x80 => array(0xE2 => 1)), // \x{008D}, \x{200D} 0x90 => array(0xC2 => 1), // \x{0090} 0x9D => array(0xC2 => 1), // \x{009D} 0xA0 => array(0xC2 => 1, 0x85 => array(0xE1 => 1), 0x81 => array(0xE2 => 1), 0xBE => array(0xEF => 1)), // \x{00A0}, \x{1160}, \x{2060}, \x{FFA0} 0xAD => array(0xC2 => 1, 0x80 => array(0xE2 => 1)), // \x{00AD}, \x{202D} 0xB8 => array(0xCC => 1), // \x{0338} 0xB7 => array(0xCC => 1), // \x{0337} 0x9F => array(0x85 => array(0xE1 => 1), 0x81 => array(0xE2 => 1)), // \x{115F}, \x{205F} 0x80 => array(0x9A => array(0xE1 => 1), 0x80 => array(0xE2 => 1, 0xE3 => 1)), // \x{1680}, \x{2000}, \x{3000} 0x8E => array(0xA0 => array(0xE1 => 1), 0x80 => array(0xE2 => 1)), // \x{180E}, \x{200E} 0x82 => array(0x80 => array(0xE2 => 1)), // \x{2002} 0x83 => array(0x80 => array(0xE2 => 1)), // \x{2003} 0x84 => array(0x80 => array(0xE2 => 1)), // \x{2004} 0x85 => array(0x80 => array(0xE2 => 1)), // \x{2005} 0x86 => array(0x80 => array(0xE2 => 1)), // \x{2006} 0x87 => array(0x80 => array(0xE2 => 1)), // \x{2007} 0x88 => array(0x80 => array(0xE2 => 1)), // \x{2008} 0x89 => array(0x80 => array(0xE2 => 1)), // \x{2009} 0x8A => array(0x80 => array(0xE2 => 1)), // \x{200A} 0x8B => array(0x80 => array(0xE2 => 1)), // \x{200B} 0x8C => array(0x80 => array(0xE2 => 1)), // \x{200C} 0x8F => array(0x80 => array(0xE2 => 1)), // \x{200F} 0xA8 => array(0x80 => array(0xE2 => 1)), // \x{2028} 0xA9 => array(0x80 => array(0xE2 => 1)), // \x{2029} 0xAA => array(0x80 => array(0xE2 => 1)), // \x{202A} 0xAB => array(0x80 => array(0xE2 => 1)), // \x{202B} 0xAC => array(0x80 => array(0xE2 => 1)), // \x{202C} 0xAE => array(0x80 => array(0xE2 => 1)), // \x{202E} 0xAF => array(0x80 => array(0xE2 => 1)), // \x{202F} 0xA4 => array(0x85 => array(0xE3 => 1)), // \x{3164} 0xBF => array(0xBB => array(0xEF => 1)), // \x{FEFF} 0xB9 => array(0xBF => array(0xEF => 1)), // \x{FFF9} 0xBA => array(0xBF => array(0xEF => 1)), // \x{FFFA} 0xBB => array(0xBF => array(0xEF => 1)), // \x{FFFB} ); // Start from the beginning and work our way in $i = 0; do { // Check to see if we have matched a first character in our utf-8 array $offset = match_sequence($string, $hex_chrs); if(!$offset) { // If not, then we must have a "good" character and we don't need to do anymore processing break; } $string = substr($string, $offset); } while(++$i); // Start from the end and work our way in $string = strrev($string); $i = 0; do { // Check to see if we have matched a first character in our utf-8 array $offset = match_sequence($string, $hex_chrs_rev); if(!$offset) { // If not, then we must have a "good" character and we don't need to do anymore processing break; } $string = substr($string, $offset); } while(++$i); $string = strrev($string); if($charlist) { $string = trim($string, $charlist); } else { $string = trim($string); } return $string; } /** * Match a sequence * * @param string $string The string to match from * @param array $array The array to match from * @param int $i Number in the string * @param int $n Number of matches * @return int The number matched */ function match_sequence($string, $array, $i=0, $n=0) { if($string === "") { return 0; } $ord = ord($string[$i]); if(array_key_exists($ord, $array)) { $level = $array[$ord]; ++$n; if(is_array($level)) { ++$i; return match_sequence($string, $level, $i, $n); } return $n; } return 0; }