Array Operations, sort, asort, ksort, array_push, and array_shift

When using array, you can simply assign values to array variables. $ A = array ('ABC', 'Def ', 'ghi'); array variable assignment

• When using array, you can simply assign values to array variables. $ A = array ('ABC', 'Def ', 'ghi ');
• The following data is generated during data generation. $ A [0] = 'abc'; $ a [1] = 'Def '; $ a [2] = 'ghi ';
• If the subscript is omitted, the array is automatically allocated for the last time. $ A [] = 'jkl '; $ a [] = 'mno ';

Break down array variables

• Array variables can be easily decomposed using the list $ d = array ('ABC', 'Def ', 'ghi'); list ($ a, $ B, $ c) = $ d;
• The following data is generated during data generation. $ A = $ d [0]; $ B = $ d [1]; $ c = $ d [2];

Decomposed string

• Set string variables and indicators to view and access character decomposition.
  $ A [0] = '0', $ a [1] Visible = '1 ′
  However, the array is not available at all because it is back and added as a reference.

$a = '0123';  print "
$a[0]
\n";  print "
$a[1]
\n";  print "
$a[2]
\n";  print "
$a[3]
\n";

Get the number of arrays

• Use count to count the array.
  The maximum number of characters to add and the value of count ($ a) is-1.

$a = array('abc', 'def', 'ghi');    $ct = count($a);

Sort and list references

• If the following arrays exist.
  $ A = array ('ABC', 'Def ', 'ghi ');
• In PHP3, code reset, while, and each are used for resetting.
  $ Tmp [0] is a subscript character, and $ tmp [1] is the actual data.

    reset($a);    while ($tmp = each($a)) {    print "
$tmp[0] - $tmp[1]
\n";    }

Array sorting (ascending)

• Use sort to sort arrays in ascending order.

    $a = array('abc', 'def', 'ghi')    sort($a);     foreach ($a as $tmp) {    print "
$tmp
\n";    }

Array sorting (descending)

• Use rsort to sort arrays in descending order.

    $a = array('abc', 'def', 'ghi');    rsort($a);     foreach ($a as $tmp) {    print "
$tmp
\n";    }

Sort joined arrays (ascending)

• Use asort to sort arrays in ascending order.

$a = array('key1' => 'abc', 'key2' => 'def', 'key3' => 'ghi');    asort($a);     foreach ($a as $key => $tmp) {    print "
$key - $tmp
\n";    }

Sort Associated arrays (descending)

• Use arsort to sort arrays in ascending order.

    $a = array('key1' => 'abc', 'key2' => 'def', 'key3' => 'ghi');    arsort($a);     foreach ($a as $key => $tmp) {    print "
$key - $tmp
\n";    }

Sort joined array key names (ascending)

• Use ksort to sort the array key names in ascending order.

    $a = array('key1' => 'abc', 'key2' => 'def', 'key3' => 'ghi');    ksort($a);     foreach ($a as $key => $tmp) {    print "
$key - $tmp
\n";    }

Sort joined array key names (descending)

• Use krsort to sort the array key names in descending order.

$a = array('key1' => 'abc', 'key2' => 'def', 'key3' => 'ghi');    krsort($a);     foreach ($a as $key => $tmp) {    print "
$key - $tmp
\n";    }

Add at the end of the array

• Use array_push at the end of the array to add elements.
  You can specify multiple data entries.
  This function is available in PHP4.

    $a = array('abc', 'def', 'ghi');     array_push($a, 'data1', 'data2');     foreach ($a as $tmp) {    print "
$tmp
\n";    }

Delete end of array

• Use array_pop at the end of the array to delete elements.
  You can specify multiple data entries.
  This function is available in PHP4.

    $a = array('abc', 'def', 'ghi');     array_pop($a, 'data1', 'data2');     foreach ($a as $tmp) {    print "
$tmp
\n";    }

Add an array header

• The array header uses array_unshift to add elements.
  You can specify multiple data entries.
  This function is available in PHP4.

    $a = array('abc', 'def', 'ghi');    array_unshift($a, 'data1', 'data2');    foreach ($a as $tmp) {    print "
$tmp
\n";    }

Delete array header

• The array header uses array_shift to delete elements.
  You can specify multiple data entries.
  This function is available in PHP4.

    $a = array('abc', 'def', 'ghi');    array_shift($a);    foreach ($a as $tmp) {    print "
$tmp
\n";    }

Array link

• The array link uses array_merge.
  This function is available in PHP4.

    $a = array('abc', 'def', 'ghi');    $b = array('123', '456', '789');    $a = array_merge($a, $b);    foreach ($a as $tmp) {    print "
$tmp
\n";    }