PHP/Data Structure/Multidimensional Array
Содержание
Accessing multidimensional array elements
<source lang="html4strict">
<? $meals = array("breakfast" => array("A","C"),
"lunch" => array("B", "E"),
"snack" => array("C","F"));
$lunches = array( array("Chicken","Eggplant","Rice"),
array("Eggplant","Tofu"));
$flavors = array("Japanese" => array("hot" => "1",
"salty" => "2"),
"Chinese" => array("hot" => "3",
"pepper-salty" => "4"));
print $meals["lunch"][1]; print $meals["snack"][0]; print $lunches[0][0]; print $lunches[2][1]; print $flavors["Japanese"]["salty"] print $flavors["Chinese"]["hot"]; ?>
</source>
Creating a Multidimensional Array
<source lang="html4strict">
<?php
$myarray = array("mykey"=> "myvalue","key2"=> array(1, 2, 3, 4));
$sub_array[] = 1;
$sub_array[] = 2;
$sub_array[] = 3;
$sub_array[] = 4;
$example["mykey"] = "myvalue";
$example["key2"] = $sub_array;
$anotherarray["mykey"] = "myvalue";
$anotherarray["key2"][] = 1;
$anotherarray["key2"][] = 2;
$anotherarray["key2"][] = 3;
$anotherarray["key2"][] = 4;
?>
</source>
Creating Multidimensional Arrays
<source lang="html4strict">
<?php
$customers= array(
array("first" => "Bill", "last" => "Jones",
"age" => 24, "state" => "CA"),
array("first" => "Joyce", "last" => "Johnson",
"age" => 21, "state" => "TX"),
);
$pet_breeds= array(
"dogs" => array("P", "T", "D"),
"birds" => array("P", "C"),
"fish" => array("G", "T", "C", "A")
);
printf("The name of the second customer is %s %s.
\n", $customers[1]["first"], $customers[1]["last"]);
printf("%s and %s
",$pet_breeds["dogs"][0], $pet_breeds["birds"][1]);
?>
</source>
Defining a Multidimensional Array
<source lang="html4strict">
<html> <head> <title>Defining a Multidimensional Array</title> </head> <body> <?php $characters = array (
array ( name=>"name 1",
occupation=>"developer",
age=>30,
specialty=>"Java" ),
array ( name=>"name 2",
occupation=>"Programmer",
age=>24,
specialty=>"C++" ),
array ( name=>"name 3",
occupation=>"designer",
age=>63,
specialty=>"Javascript" )
); print $characters[0][occupation]; ?> </body> </html>
</source>
Displaying a multidimensional array
<source lang="html4strict">
<?php $objects=array("A" => array("Shape" => "Cylinder",
"Color" => "Red",
"Material" => "Metal"),
"B" => array("Shape" => "Rectangle",
"Color" => "White",
"Material" => "Paper"),
"C" => array("Shape" => "Sphere",
"Color" => "Red",
"Material" => "Fruit"),
"D" => array("Shape" => "Sphere",
"Color" => "Orange",
"Material" => "Fruit"),
"E" => array("Shape" => "Rectangle",
"Color" => "Yellow",
"Material" => "Paper"));
echo $objects["Soda can"]["Shape"]; foreach ($objects as $obj_key => $obj) {
echo "$obj_key:
"; while (list ($key,$value)=each ($obj)) { echo "$key = $value "; } echo "
";
} ?>
</source>
Displaying a Multidimensional Array using For each
<source lang="html4strict">
<?php
$emp_det = array (array (Name=>"a", Code=> "8", Hobby=> "A"),
array (Name=>"b", Code=> "8", Hobby=> "B"),
array (Name=>"c", Code=> "1", Hobby=> "C"),
array (Name=>"d", Code=> "3", Hobby=> "D"),
);
foreach ($emp_det as $tempone) {
foreach ($tempone as $key=>$temptwo) {
echo "$key: $temptwo", "\n";
}
echo "\n";
}
?>
</source>
Displaying Multidimensional Arrays
<source lang="html4strict">
<?php function display_array($arr, $spacing) {
$widths = array();
foreach ($arr as $row) {
foreach ($row as $key => $col) {
if (!isset($widths[$key]) || (strlen($col) > $widths[$key])) {
$widths[$key] = strlen($col);
}
}
}
echo "";
foreach ($arr as $row) {
$count = 0;
foreach ($row as $key => $col) {
if ($count++) {
echo str_repeat(" ", $spacing);
}
echo str_pad($col, $widths[$key]);
}
echo "\n";
}
}
$test_array = array(
array("A", "B", "C", "D", "E"),
array("a", "b", "c", "d", "e"),
);
display_array($test_array, 3);
?>
</source>
==Find the Maximum Value in a Multidimensional Array==
<!-- start source code -->
<source lang="html4strict">
<?php
function recursive_array_max($a) {
foreach ($a as $value) {
if (is_array($value)) {
$value = recursive_array_max($value);
}
if (!(isset($max))) {
$max = $value;
} else {
$max = $value > $max ? $value : $max;
}
}
return $max;
}
$dimensional = array(
7,
array(3, 5),
array(5, 4, 7, array(3, 4, 6), 6),
14,
2,
array(5, 4, 3)
);
$max = recursive_array_max($dimensional);
echo "<p>The maximum value was: {$max}</p>";
?>
</source>
==Generating fixed-width field data records without==
<!-- start source code -->
<source lang="html4strict">
<?php
$books = array( array("A","S", 1927),
array("T","L",1971),
array("T","W",1979) );
foreach ($books as $book) {
$title = str_pad(substr($book[0], 0, 25), 25, ".");
$author = str_pad(substr($book[1], 0, 15), 15, ".");
$year = str_pad(substr($book[2], 0, 4), 4, ".");
print "$title$author$year\n";
}
?>
</source>
==Looping Through a Multidimensional Array==
<!-- start source code -->
<source lang="html4strict">
<html>
<head>
<title>Looping Through a Multidimensional Array</title>
</head>
<body>
<?php
$characters = array (
array ( name=>"name 1",
occupation=>"developer",
age=>30,
specialty=>"Java" ),
array ( name=>"name 2",
occupation=>"Programmer",
age=>24,
specialty=>"C++" ),
array ( name=>"name 3",
occupation=>"designer",
age=>63,
specialty=>"Javascript" )
);
foreach ( $characters as $val ){
foreach ( $val as $key=>$final_val ){
print "$key: $final_val<br>";
}
print "<br>";
}
?>
</body>
</html>
</source>
==Manipulating multidimensional arrays==
<!-- start source code -->
<source lang="html4strict">
<?
$prices["dinner"]["A"] = 12.50;
$prices["lunch"]["B"] = 4.95;
$prices["dinner"]["C"] = 8.95;
$prices["dinner"]["total"] = $prices["dinner"]["A"] +
$prices["dinner"]["B"];
$specials[0][0] = "aa";
$specials[0][1] = "bb";
$specials[0][2] = "cc";
$specials[1][0] = "dd";
$specials[1][1] = "ee";
$specials[1][] = "Peanut Salad";
?>
</source>
==Multidimensional array element value interpolation==
<!-- start source code -->
<source lang="html4strict">
<?
$specials = array( array("A", "A", "B"),
array("C","W", "P") );
for ($i = 0, $num_specials = count($specials); $i < $num_specials; $i++) {
for ($m = 0, $num_sub = count($specials[$i]); $m < $num_sub; $m++) {
print "Element [$i][$m] is {$specials[$i][$m]}\n";
}
}
?>
</source>
==Reference element in multidimensional Arrays==
<!-- start source code -->
<source lang="html4strict">
<?php
$emp_det = array (array (Name=>"a", Code=> "8", Hobby=> "A"),
array (Name=>"b", Code=> "8", Hobby=> "B"),
array (Name=>"c", Code=> "1", Hobby=> "C"),
array (Name=>"d", Code=> "3", Hobby=> "D"),
);
echo $emp_det [0] [Hobby];
?>
</source>
==Sorting Multidimensional Arrays==
<!-- start source code -->
<source lang="html4strict">
<?php
$data = array(
array("country"=>"Spain", "language"=>"Spanish", "visitors"=>1289),
array("country"=>"France", "language"=>"French", "visitors"=>984),
array("country"=>"Argentina", "language"=>"Spanish", "visitors"=>812)
);
printf("<pre>%s\n", var_export($data, TRUE));
$cols = array(); foreach($data as $row) {
foreach($row as $key => $value) {
if( !isset($cols[$key]) )
$cols[$key] = array();
$cols[$key][] = $value;
}
} $data = $cols; array_multisort($data["language"], $data["country"], $data["visitors"]);
printf("%s\n", var_export($data, TRUE));
?>
</source>
