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PHP Ds / Sequence Reduce () Function

Syntax:
mixed abstract public DsSequence::reduce (callable $callback [, mixed $initial])
Parameters:This function takes two parameters as above and described below:
  • $callback:This parameter contains a function that contains operation on elements and storage in transfer. This callback function contains two arguments, carry and value, where carry - is the value returned by the function, and the value - this is the element’s value at the current iteration.
  • $initial:this parameter contains the initial hyphenation value, which can be NULL.
Return Value:This function returns the final value of the callback function.The following programs illustrate the Ds / Sequence::redu()function in PHP:Program 1:  
// Declare a new sequence $seq = new DsVector ([1, 2, 3, 4, 5]); echo ( " Sequence Elements " ); print_r ( $seq );  
// callback function with downgrade echo ( "Element after performing operation" ); var_dump ( $seq -> reduce ( function ( $carry , $element ) { return $carry + $element + 2;}));  
?>
Exit:
Sequence Elements DsVector Object ([0] = > 1 [1] = > 2 [2] = > 3 [3] = > 4 [4] = > 5) Element after performing operation int (25)
Program 2:  
// Declare a new sequence $seq = new DsVector ([10, 20, 30, 40, 50]); echo ( " Original sequence elements " ); print_r ( $seq ); $func_gfg = function ( $carry , $element ) { return $carry * $element ; }; echo ( " Sequence after reducing to single element " );  
// Using the redu() function var_dump ( $seq -> reduce ( $func_gfg , 10));  
?>
Exit:
Original sequence elements DsVector Object ([0] = > 10 [1] = > 20 [2] = > 30 [3] = > 40 [4] = > 50) Sequence after reducing to single element int (120000000)
Link: https://www.php.net /manual/en/ds-sequence.reduce.php

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