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str_split()

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<?php
$array 
str_split (
    
// string $string
    
  // [int $split_length = 1]
);
?>
Result
$array = [
  
=> 'Hel',
  
=> 'lo ',
  
=> 'Fri',
  
=> 'end',
]
Examples
#1 str_split  ("Hello Friend")
#2 str_split  ("Hello Friend",
 
3)
See also
chunk_split, count_chars, explode, preg_split, str_word_count