[Solved] How to add every single charater end and begining

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You can use preg_split('//u', $yourText, -1, PREG_SPLIT_NO_EMPTY) and array_map like this:

$yourText="TEXTRANDOM";
// execute a function for every letter in your string
$arrayOfTags = array_map(function (string $letter): string {
    return '1'.$letter.'_'; // concat every letter with number and _
}, preg_split('//u', $yourText, -1, PREG_SPLIT_NO_EMPTY));
echo implode('', $arrayOfTags); // make the array into a string back again

str_split will split the string into bytes instead of letters. To split the string into array of letters you can use preg_split('//u', $yourText, -1, PREG_SPLIT_NO_EMPTY).
You can also do it with just a loop:

$arrayOfletters = preg_split('//u', $yourText, -1, PREG_SPLIT_NO_EMPTY);
foreach ($arrayOfletters as $letter) {
    echo '1'.$letter.'_';
}

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solved How to add every single charater end and begining