How to search an array

Functions for performing mathematical calculations on arrays

array_sum($array)
array_product($array)

How to add all values in an array

      $prices = array(141.95, 212.95, 411, 10.95);

      $sum = array_sum($prices);
      Outputsum = 776.85

Functions for searching arrays

in_array($value, $array [, $strict])
array_key_exists($key, $array)
array_search($value, $array [, $strict])
array_count_values($array)

How to search an array

      
      $tax_rates = array('NC' => 7.75, 'CA' => 8.25, 'NY' => 8.875); 

      $is_found = in_array(7.75, $tax_rates);  // TRUE

      $is_found = in_array('7.75', $tax_rates);  // TRUE

      $is_found = in_array('7.75', $tax_rates, true);  // FALSE

      $key_exists = array_key_exists('CA', $tax_rates);  // TRUE

      $key = array_search(7.75, $tax_rates); // 'NC'

How to count the number of occurrences of a value in an array

      $names = array('Mike', 'Mike', 'Mike', 'Anne', 'Joel', 'Joel');

      $occurences = array_count_values($names);

      echo($occurences['Mike']); // 1

      echo($occurences['Anne']); // 3

      echo($occurences['Joel']); // 3
      OutputMike: 3

Anne: 1

Joel: 2

A stack is a special type of array that implements a last-in, first-out (LIFO) collec-tion of values. You can use the array_push() and array_pop() functions to add and remove elements in a stack.
A queue is a special type of array that implements a first-in, first-out (FIFO) collection of values. You can use the array_push() and array_shift() functions to add and remove elements in a queue.
The functions in this figure modify the array that’s passed to the function. In other words, they don’t return a new array.

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