Split emoji string

user_7844956 0
Viewed 267

I would like to split a string which contains emojis. I don't understand why my function generates an empty character.

Code :

function str_split_unicode($str, $l = 0) {
    if ($l > 0) {
      $ret = array();
      $len = mb_strlen($str, "UTF-8");
      for ($i = 0; $i < $len; $i += $l) {
        $ret[] = mb_substr($str, $i, $l, "UTF-8");
      }
      return $ret;
   }
   return preg_split("//u", $str, -1, PREG_SPLIT_NO_EMPTY);
}

$emoji_value = "⬜️";
$emoji_split = str_split_unicode($emoji_value,1);

print_r($emoji_split);

Result :

Array
(
    [0] => 
    [1] => ⬜
    [2] => ️
    [3] => 
)

Hope it`s clear. Any help is greatly appreciated!

emoji php
3 Answers

Try to add array_filter to remove null value:

return array_filter(preg_split("//u", $str, -1, PREG_SPLIT_NO_EMPTY));
user_129781930

The string has 4 characters. The third one is:

echo bin2hex(mb_substr("⬜️", 2, 1, "UTF-8"));

Output:

efb88f

It corresponds to character U+FE0F:

This codepoint may change the appearance of the preceding character. If that is a symbol, dingbat or emoji, U+FE0F forces it to be rendered as a colorful image as compared to a monochrome text variant.

user_127639540

I tried to find a way how to delete that extra character based on @Olivier 's response without luck. I am sharing my code maybe it is going to be useful for someone to find the solution: 

<?php
function isStringHasEmojis($string) {
    $emojis_regex =
        '/[\x{0080}-\x{02AF}'
        .'\x{0300}-\x{03FF}'
        .'\x{0600}-\x{06FF}'
        .'\x{0C00}-\x{0C7F}'
        .'\x{1DC0}-\x{1DFF}'
        .'\x{1E00}-\x{1EFF}'
        .'\x{2000}-\x{209F}'
        .'\x{20D0}-\x{214F}'
        .'\x{2190}-\x{23FF}'
        .'\x{2460}-\x{25FF}'
        .'\x{2600}-\x{27EF}'
        .'\x{2900}-\x{29FF}'
        .'\x{2B00}-\x{2BFF}'
        .'\x{2C60}-\x{2C7F}'
        .'\x{2E00}-\x{2E7F}'
        .'\x{3000}-\x{303F}'
        .'\x{A490}-\x{A4CF}'
        .'\x{E000}-\x{F8FF}'
        .'\x{FE00}-\x{FE0F}'
        .'\x{FE30}-\x{FE4F}'
        .'\x{1F000}-\x{1F02F}'
        .'\x{1F0A0}-\x{1F0FF}'
        .'\x{1F100}-\x{1F64F}'
        .'\x{1F680}-\x{1F6FF}'
        .'\x{1F910}-\x{1F96B}'
        .'\x{1F980}-\x{1F9E0}]/u';
    preg_match($emojis_regex, $string, $matches);
    return !empty($matches);
}

function str_split_unicode($str, $l = 0) {
    if ($l > 0) {
        $res = [];      
        $len = mb_strlen($str, "UTF-8");                
        for ($i = 0; $i < $len; $i += $l) {
            $val = mb_substr($str, $i, $l, "UTF-8");
            if(isStringHasEmojis($val)) {
                $res[] = $val;
            }

        }
        return $res;
    }
}

$emoji_value = "⬜️";
$emoji_split = str_split_unicode($emoji_value,1);

echo "<pre>";
print_r($emoji_split);
user_64345770
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