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PHP Ds / Sequence sort () function

Syntax:
void abstract public DsSequence::sort ([callable $comparator])
Parameters:This function takes a single parameter, $comparator, which is used to store the comparison function. The comparison function returns an integer value less than, greater than or equal to zero.Returned value:This function does not return any values.The following programs illustrate the Ds / Sequence::sort()in PHP:Program 1:  
// Create a new sequence $seq = new DsVector ([2, 4, 1, 9, 6, 5, 12, 9]);  
// Use the sort() function to sort
// sequence element $seq -> sort(); print_r ( $seq );  
?>
Output:
DsVector Object ([0] = > 1 [1] = > 2 [2] = > 4 [3] = > 5 [4] = > 6 [5] = > 9 [ 6] = > 9 [7] = > 12)
Program 2:  
// Create a new sequence $seq = new DsVector ([2, 4, 1, 9, 6, 5, 12, 9]);  
// Use the sort() function to sort
// sequence element $seq -> sort ( function ( $x , $y ) { return $y < = > $x ; }); print_r ( $seq );  
?>
Output:
DsVector Object ([0] = > 12 [1] = > 9 [2] = > 9 [3] = > 6 [4] = > 5 [5] = > 4 [ 6] = > 2 [7] = > 1)
Link: http://php.net/manual/en/ds-sequence.sort.php

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