Question

How to count frequency of each element in an array in PHP

Answer 1

$arr = array(4, 1, 2, 8, 9, 5, 5, 1, 7, 8, 8);   
$frequency = array(0, 0, 0, 0, 0, 0, 0, 0, 0, 0); // 0 - 9

for ($i = 0; $i < count($arr); $i++) {
    $frequency[$arr[$i]]++;
}
     
for ($i = 0; $i < 10; $i++) {
    if ($frequency[$i])
        echo $i . ": - " . $frequency[$i] . " times" . "\n";
}

    
    
    
    
/*
run:
    
1: - 2 times
2: - 1 times
4: - 1 times
5: - 2 times
7: - 1 times
8: - 3 times
9: - 1 times
      
*/

 

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