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Php Arrays Examples

Using The Array_Push () Function

 
     <?php
  $vocalists = array ("A", "B", "C");
  $musicians = array_push($vocalists, "D", "E", "F");  echo "The total number of musicians are $musicians:", "\n";  foreach ($vocalists as $val) {
    echo "$val", "\n";
  }
  ?>

Using The Array_Remove() Function To Remove Several Elements From The Beginning And The End Of An Array:

<?php
$languages = array( 'French', 'German', 'Russian', 'Chinese');
printf("<p>Original array:\n%s</p>\n", var_export($languages, TRUE)); $num = 2;
$removed1 = array_remove($languages, 0, $num);
$removed2 = array_remove($languages, count($languages) - $num, $num);
printf("<p>Removed (start): %s<br />Removed (end): %s<br /> Remaining: %s</p>\n", var_export($removed1, TRUE), var_export($removed2, TRUE), var_export($languages, TRUE));
?>

Using_The Array_Shift () Function

 
     <?php
  $music = array ("A", "B", "C", "D");
  while (count ($music)) {
     $somevalue = array_shift ($music);
     echo "$somevalue", "<br />";
     echo count ($music);
     echo "<br />";
  }
  ?>

Using The Array_Slice () Function

 
    <?php
  $musicgenre = array ("A","B","C","D","E","F","G");  echo "array_slice ($musicgenre, 4, 2):", "<br />";  $Dave = array_slice ($musicgenre, 4, 2);
  foreach ($Dave as $valone) {
     echo "$valone", "<br />";
  }
  echo "<br />";
  echo "array_slice ($musicgenre, 1, 3):", "<br />";  $Brad = array_slice ($musicgenre, 1, 3);
  foreach ($Brad as $valtwo) {
     echo "$valtwo", "<br />";
  }
  echo "<br />";
  echo "array_slice ($musicgenre, 3, 3):", "<br />";  $Joe = array_slice ($musicgenre, 3, 3);
  foreach ($Joe as $valthree) {
     echo "$valthree", "<br />";
  }  echo "<br />";
  echo "array_slice ($musicgenre, -4, 2):", "<br />";
  $Rick = array_slice ($musicgenre, -4, 2);
  foreach ($Rick as $valfour) {
     echo "$valfour", "<br />";
  }
 
  echo "<br />";
  echo "array_slice ($musicgenre, 1):", "<br />";
  $John = array_slice ($musicgenre, 1);
  foreach ($John as $valfive) {
    echo "$valfive", "<br />";
  }
?>

Using The Array_Unique () Function

 
    <?php
  $oldarray = array ("A", "B", "C", "D", "E", "F");
  $newarray = array_unique ($oldarray);
 
  foreach ($newarray as $val) {
     echo "$val", "\n";
  }
?>

Using The Explode() Function

<?phpphp    $input_string = "this is a test.";    $pieces = explode(",", $input_string);    echo "Names in List: <br/>\n";
    foreach($pieces as $name) {
        echo trim($name) . "<br/>\n";
    }?>

Using The Implode() Function

<?phpphp    $input_array = array("J",
                         "M",
                         "M");    $orig_string  = implode(", ", $input_array);?>

Using The Sort () Function

 
     <?php
  $emp_names []= "D";
  $emp_names []= "B";
  $emp_names []= "A";
  $emp_names []= "C";
  $emp_names []= "E";
 
  sort ($emp_names);
  foreach ($emp_names as $val) {
     echo "$val", "\n";
  }
 ?>

Using Uasort() To Sort A Multdimensional Associative Array By One Of Its Fields

 
    <?php
$products = array( array( name=>"A", price=>4.5  ),
                   array( name=>"C", price=>5.5  ),
                   array( name=>"D", price=>2.5  ),
                   array( name=>"B", price=>2.5  )
);
function priceCmp( $a, $b ){
   if  ( $a[price] == $b[price] )
        return 0;
   if  ( $a[price] < $b[price] )
         return -1;
   return 1;
}
uasort( $products, priceCmp );
foreach ( $products as $key => $val )
     print "$key: $val[price]<br />\n";
?>

Using Uksort() To Sort An Associative Array By The Length Of Its Keys

 
    <?php
$exes = array( x => 1,
               xxx => 3,
               xx => 2,
               xxxxx => 4,
               xxxxxx => 5
);
function priceCmp( $a, $b ){
    if ( strlen( $a ) == strlen( $b ) )
        return 0;
    if ( strlen( $a ) < strlen( $b ) )
        return -1;
    return 1;
}
uksort( $exes, priceCmp );
foreach ( $exes as $key => $val )
    print "$key: $val<br />\n";
?>

Using Usort() To Sort A Multidimensional Array By One Of Its Fields

 
    <?php
$products = array( array( name=>"A", price=>4.5  ),
                   array( name=>"C", price=>5.5  ),
                   array( name=>"D", price=>2.5  ),
                   array( name=>"B", price=>2.5  )
);function priceCmp( $a, $b ){
    if ( $a[price] == $b[price] )
        return 0;
    if ( $a[price] < $b[price] )
         return -1;
    return 1;
}
usort( $products, priceCmp );
foreach ( $products as $val )
     print "$val[name]: $val[price]<br />\n";
?>

Using Variable Variables To Create Associations

<?phpphp
$favorite_color = 'blue';
$favorite_weapon = 'gun';
$favorite_drink = 'beer';$favorite_things = array('color', 'weapon', 'drink');foreach ($favorite_things as $thing) {
    echo '<p>', $thing, ' = ', ${"favorite_{$thing}"}, '</p>';
}
?>

Usort() Sorts An Array Based On Your Own Predefined Criteria.

 
Its syntax is: void usort(array array, string function_name)<?
    $vocab = array("S123","A1234", "P12345", "A1234567","T");
 
    function compare_length($str1, $str2) {
         $length1 = strlen($str1);
         $length2 = strlen($str2);
 
         if ($length1 == $length2) :
              return 0;
         elseif ($length1 < $length2) :
              return -1;
         else :
              return 1;
         endif;
    }
    usort($vocab, "compare_length");
 
    while (list ($key, $val) = each ($vocab)) {
         echo "$val<br />";
    }
?>

Validating A Drop-Down Menu With Array_Key_Exists()

<?phpphp$choices = array('eggs' => 'E',
                 'toast' => 'T',
                 'coffee' => 'C');
echo "<select name='food'>\n";
foreach ($choices as $key => $choice) {
   echo "<option value='$key'>$choice</option>\n";
}
echo "</select>";if (! array_key_exists($_POST['food'], $choices)) {
    echo "You must select a valid choice.";
}
?>

Working With Unique Values

<?phpphp
  $countries = array( 'USA' => 'English', 'Spain' => 'Spanish',
                      'Brasil' => 'Portuguese', 'UK' => 'English',
                      'France' => 'French', 'Argentina' => 'Spanish');  $languages = array_unique($countries);
  printf("<pre>%s

\n”, var_export($languages, TRUE)); $languages = array_unique( array_values($countries) );
printf(“ 

%s

\n”, var_export($languages, TRUE)); $languages = array_values( array_unique($countries) );
printf(“ 

%s

\n”, var_export($languages, TRUE));
?>

Sorting With Arsort()

<?php
$meal = array('breakfast' => 'A',
              'lunch' => 'B',
              'snack' => 'C',
              'dinner' => 'D');print "Before Sorting:\n";
foreach ($meal as $key => $value) {
    print "   \$meal: $key $value\n";
}arsort($meal);print "After Sorting:\n";
foreach ($meal as $key => $value) {
    print "   \$meal: $key $value\n";
}
?>

Sorting With Asort()

<?php
$meal = array('breakfast' => 'A',
              'lunch' => 'B',
              'snack' => 'C',
              'dinner' => 'D');print "Before Sorting:\n";
foreach ($meal as $key => $value) {
    print "   \$meal: $key $value\n";
}asort($meal);print "After Sorting:\n";
foreach ($meal as $key => $value) {
    print "   \$meal: $key $value\n";
}
?>

Sorting With Ksort()

<?php
$meal = array('breakfast' => 'A',
              'lunch' => 'B',
              'snack' => 'C',
              'dinner' => 'D');print "Before Sorting:\n";
foreach ($meal as $key => $value) {
    print "   \$meal: $key $value\n";
}ksort($meal);print "After Sorting:\n";
foreach ($meal as $key => $value) {
    print "   \$meal: $key $value\n";
}
?>

Sorting With Sort()

<?php
$dinner = array('A',
                'B',
                'C');
$meal = array('breakfast' => 'A',
              'lunch' => 'B',
              'snack' => 'C',
              'dinner' => 'D');print "Before Sorting:\n";
foreach ($dinner as $key => $value) {
    print " \$dinner: $key $value\n";
}
foreach ($meal as $key => $value) {
    print "   \$meal: $key $value\n";
}sort($dinner);
sort($meal);print "After Sorting:\n";
foreach ($dinner as $key => $value) {
    print " \$dinner: $key $value\n";
}
foreach ($meal as $key => $value) {
    print "   \$meal: $key $value\n";
}
?>

Sort.Php

<?phpphp$grades = array(42,57,98,100,100,43,78,12);
sort($grades);
print_r($grades);?>

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