In for loop how to check current array value with all previous array in php

Question

In for loop how to check current value with each and every previous value using php

my array:

In array list [prolabelpos] =>0 having three times, how to execute a [prolabelpos] =>0 only one time in for loop . how to check current array with all previous value and [prolabelpos] =>0 execute once in the for loop

Array ( 
    [0] => Array ( [productlabel_id] => 6 [prolabelpos] => 0  ) 
    [1] => Array ( [productlabel_id] => 5  [prolabelpos] => 6  )
    [2] => Array ( [productlabel_id] => 4  [prolabelpos] => 0 )
    [3] => Array ( [productlabel_id] => 3  [prolabelpos] => 5  )
    [4] => Array ( [productlabel_id] => 2 [prolabelpos] => 0  )
)

my code:

<?php  
$prev = null;
foreach ($result as $key => $value) {
    $label_position = $value['prolabelpos'];
    if ($prev != $label_position) {
        echo "my code";
    }
    $prev = $label_position;
}

I'm not quite clear on what you're trying to achieve.. You want only one result with prolabelpos = 0? What do you want to do with the other cases (where the ID is 4 and 2)? — Qirel
– Qirel, Commented May 3, 2019 at 6:08
previous value of [prolabelpos] =>0 (where id 4 and 2) not need to execute, i need to execute only higher order id 6 value of [prolabelpos] =>0 — Divya Sekar
– Divya Sekar, Commented May 3, 2019 at 6:12

Rakesh Jakhar · Accepted Answer · 2019-05-03 06:16:33Z

You can approach this in foreach OR array_map

$arr = 
 Array ( 
 '0' => Array ( 'productlabel_id' => 6, 'prolabelpos' => 0  ),
 '1' => Array ( 'productlabel_id' => 5,  'prolabelpos' => 6  ),
 '2' => Array ( 'productlabel_id' => 4,  'prolabelpos' => 0 ),
 '3' => Array ( 'productlabel_id' => 3,  'prolabelpos' => 5  ),
 '4' => Array ( 'productlabel_id' => 2 ,'prolabelpos' => 0  )
);
$traversed = array();
foreach($arr as $value){
  if(in_array($value['prolabelpos'], $traversed)){
    //This has been traversed before
  }else{
    /* Apply your Logic */
    $traversed[] = $value['prolabelpos'];
  }
}

Using array_map

$arr = Array ( 
  '0' => Array ( 'productlabel_id' => 6, 'prolabelpos' => 0  ),
  '1' => Array ( 'productlabel_id' => 5,  'prolabelpos' => 6  ),
  '2' => Array ( 'productlabel_id' => 4,  'prolabelpos' => 0 ),
  '3' => Array ( 'productlabel_id' => 3,  'prolabelpos' => 5  ),
  '4' => Array ( 'productlabel_id' => 2 ,'prolabelpos' => 0  )
);
$traversed = array();
array_map(function($v) use (&$traversed){
  if(in_array($v['prolabelpos'], $traversed)){
    //This has been traversed before
  }else{
    /* Apply your Logic */
    $traversed[] = $v['prolabelpos'];
  }
}, $arr);

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