How to assign values ​​to PHP arrays

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One of the methods creates an array:

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<?php 
$a="abcd"; 
print($a[0]." ".$a[1]." ".$a[2]." ".$a[3]." "); 
?>

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## Running result: a b c d

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<?php 
$http=array("www","csdn","net");  
print($http[0].".".$http[1].".".$http[2]);  
?>

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