Functions php array

• reset
  http://php.net/manual/en/function.reset.php
  Set the current array pointer to default (first element)
  The current element could be outputed by writing current($array);
  The pointer could be changed with next($array) or prev($aray)

• array_filter
  http://php.net/manual/fr/function.array-filter.php
  Allow to filter an array by a custom function that return the value to keep,
  and if no function is given, it'll filter out FALSE value ('' , FALSE , 0 , NULL)

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• array_shift
  http://fr2.php.net/array_shift
  array_shift() shifts (remove) the first value of the array off and returns it, shortening the array by one element and moving everything down. All numerical array keys will be modified to start counting from zero while literal keys won't be touched. Return the shifted value.

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• array_flip
  http://php.net/manual/en/function.array-flip.php
  Allow to flip an array so that value become key and vice-versa

$array = array(
 '1' => 'value1',
 '2' => 'value2',
);
$array_flipped = array_flip($array);
print_r($array_flipped);

Display

array(
 'value1' => 1,
 'value2' => 2 
);

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• array_intersect_keys
  http://php.net/manual/en/function.array-intersect-key.php
  Interest two array with key as comparison => keep in the resulting array only the keys that have a key in common

• array_unique
  http://php.net/manual/en/function.array-unique.php
  Allow to remove duplicate value in an array, keep the first occurence.