array_search


php128 apg

SEARCHES the ARRAY for a given value and returns the first corresponding key.





This function returns the key for $needle if it is found in the ARRAY, FALSE otherwise..

If $needle is a STRING, the comparison is done in a case-sensitive manner.

If $needle is found in $haystack more than once, the first matching key is returned.



<?php

mix array_search ( mix $needle , arr $haystack [, bool $strict = FALSE ] )


where,

%needle = The value to be searched

$array = The working array

$strict = To control whether identical elements or not

?>

 $needle 


The searched value.



 $haystack 


The given ARRAY.



$strict


To control if the search is made for identical elements or not.

STRICT MODE
VALUES PURPOSE
0 (FALSE) === will not be used
1 (TRUE) === will be used
ed48


  1 EXERCISE   

<?php

$arr01a = array(2, 8, 18, 32, array (32, 18, 8));

$arr01b = [ 2, 8, 18, 32, [ 32, 18, 8 ] ];

$arr01c = [ 2, 8, '18', 32, [ 'THIRTY-TWO', "eighteen", 8 ] ];

$arr01d= array("K" => 2, "L" => 8, 
                         "M" => 18, "N" => 32, 
                         "O" => 32, "P" => 18, "Q" => 8);
                         
$arr01e = [ 299792458, 6.67428E-11, [ 'c', "G" ] ];

$arr01f = ['01023', '0B0011', '0x20b', 
                ['octal', 'binary', 'hexadecimal' ] ];

$arr01g = ["Countries", "continentes", 
                ["Brasil", "Portugal", "Japan"], 
                ["South America", "Europe", "Asia"] ];
                
$arr01h = [ "RGB" => ["RED", "GREEN", "BLUE"], 
                 "HSB" => ["HUE", "SATURATION", "BLACK"] ]; 

$arr01i = ["HUE", "SATURATION", "BLACK" ];
                

$valarr01 = [ 0, 2, 8, 18, '18', 32, 
               'THIRTY-TWO', "eighteen", 
               299792458, '0x20b', "continentes",
               'rgb', 'RGB', 'black', 'BLACK', 
               'hue', 'HUE' ];
               
$vala01 = mt_rand(0, count($valarr01, 1) - 1);

$val = $valarr01[$vala01];

echo '<br>Element to be searched: ' . $val . 
                     ' (' . gettype($val) . ')<br><br>';

function arrsearch01($val, $arr)
{

$ser01 = array_search($val, $arr);

if($ser01)
  {
echo 'The ARRAY given:<br>';  
print_r($arr);
echo '<br>The index of the searched element is ';

  var_export ($ser01);
  echo '<br><br>';
  }
  else
  {
echo 'The ARRAY given:<br>';  
print_r($arr);
echo '<br>THE ELEMENT SEARCHED, WAS NOT FOUND!<br><br>';
  }
}

arrsearch01($val, $arr01a);

arrsearch01($val, $arr01b);

arrsearch01($val, $arr01c);

arrsearch01($val, $arr01d);

arrsearch01($val, $arr01e);

arrsearch01($val, $arr01f);

arrsearch01($val, $arr01g);

arrsearch01($val, $arr01h);

arrsearch01($val, $arr01i);

?> 

  2 EXERCISE   

<?php

$arr02 = [ "RGB" => ["RED", "GREEN", "BLUE"], 
                "HSB" => ["HUE", "SATURATION", "BLACK"] ]; 

$val02 = ["HUE", "SATURATION", "BLACK"];

$ser02 = array_search($val02, $arr02);

if($ser02)
  {
echo 'The ARRAY given:<br>';  
print_r($arr02);
echo '<br>The index of the searched element is ';
print_r($ser02);
echo '.':
  }
  else
  {
echo 'The ARRAY given:<br>';  
print_r($arr02);
echo '<br>THE ELEMENT SEARCHED, WAS NOT FOUND!<br><br>';
  }

?>

 RESULT   

The ARRAY given:
Array ( [RGB] => Array ( [0] => RED [1] => GREEN [2] => BLUE ) [HSB] => Array ( [0] => HUE [1] => SATURATION [2] => BLACK ) )
The index of the searched element is HSB.

  3 EXERCISE   

<?php

$arr03 = [ "RGB" => ["RED", "GREEN", "BLUE"], 
                "HSB" => ["HUE", "SATURATION", "BLACK"] ]; 

$val03 = ["hue", "saturation", "black"];

$ser03 = array_search($val03, $arr03);

if($ser03)
  {
echo 'The ARRAY given:<br>';  
print_r($arr03);
echo '<br>The index of the searched element is ';
print_r($ser03);
  }
  else
  {
echo 'The ARRAY given:<br>';  
print_r($arr03);
echo '<br>THE ELEMENT SEARCHED, WAS NOT FOUND!<br><br>';
  }

?>

 RESULT   

The ARRAY given:
Array ( [RGB] => Array ( [0] => RED [1] => GREEN [2] => BLUE ) [HSB] => Array ( [0] => HUE [1] => SATURATION [2] => BLACK ) )
THE ELEMENT SEARCHED, WAS NOT FOUND!

  4 EXERCISE   

<?php

$var04 = array("one" => 1, "two" => 2, "THREE" => "3"); 

$val04 = 3;

$ser04 = array_search($val04, $var04);

if($ser04)
  {
echo 'The ARRAY given:<br>';  
print_r($var04);
echo '<br>The index of the searched element is ';
print_r($ser04);
echo '.';
  }
  else
  {
echo 'The ARRAY given:<br>';  
print_r($var04);
echo '<br>THE ELEMENT SEARCHED, WAS NOT FOUND!<br><br>';
  }

?>

 RESULT   

The ARRAY given:
Array ( [one] => 1 [two] => 2 [THREE] => 3 )
The index of the searched element is THREE.