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preg_split()

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<?php
$array 
preg_split (
    
// string $pattern
    
// string $subject
    
// [int $limit = -1]
    
?  // [int $flags = 0]
);
?>
Result
$array = [
  
=> 's',
  
=> 't',
  
=> 'r',
  
=> 'i',
  
=> 'n',
  
=> 'g',
]
Examples
#1 preg_split  ('/[\s ]+/',
 
"hypertext language, programming")
#2 preg_split  ("//",
 
"string",
 -
1,
 
PREG_SPLIT_NO_EMPTY)
#3 preg_split  ("/ /",
 
"hypertext language programming",
 -
1,
 
PREG_SPLIT_OFFSET_CAPTURE)
See also
implode, preg_last_error, preg_match, preg_match_all, preg_quote, preg_replace