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PHP Multidimensional Array.
Definition and Usage
A multidimensional array in PHP an be treated as an array of arrays so that each element within the array is an array itself. Inner elements of a multi dimensional array may be associative or indexed.
Although arrays can be nested upto any levels, two dimensional array with more than one dimensional arrays inside outermost is of realistic use
Syntax
//two dimensional associative array twodim = array( "row1"=>array(k1=>v1,k2=>v2,k3=>v3), "row2"=>array(k4=>v4,k5=>v5,k6=>v6) ) //two dimensional indexed array twodim=array( array(v1,v2,v3), array(v4,v5,v6) )
In case of indexed two dimensional array, we can access an element from the array by its index with following syntax:
$arr[row][column];
PHP Version
Use of square brackets for assignment of array is available since PHP 5.4
Following example shows indexed 2D array in which each element is an indexed array
Example
<?php
$arrs=array(
array(1,2,3,4,5),
array(11,22,33,44,55),
);
foreach ($arrs as $arr){
foreach ($arr as $i){
echo $i . " ";
}
echo "
";
}
$cols=count($arrs[0]);
$rows=count($arrs);
for ($i=0; $i<$rows; $i++){
for ($j=0;$j<$cols;$j++){
echo $arrs[$i][$j] . " ";
}
echo "
";
}
?>Output
This will produce following result −
1 2 3 4 5 11 22 33 44 55 1 2 3 4 5 11 22 33 44 55
Following example has indexed 2D array whaving associative arrays as element
Example
<?php
$arrs=array(
array(1=>100, 2=>200, 3=>300),
array(1=>'aa', 2=>'bb', 3=>'cc'),
);
foreach ($arrs as $arr){
foreach ($arr as $i=>$j){
echo $i . "->" .$j . " ";
}
echo "
";
}
for ($row=0; $row < count($arrs); $row++){
foreach ($arrs[$row] as $i=>$j){
echo $i . "->" .$j . " ";
}
echo "
";
}
?>Output
This will produce following result −
1->100 2->200 3->300 1->aa 2->bb 3->cc 1->100 2->200 3->300 1->aa 2->bb 3->cc }
In following example we have an associative two dimensional array:
Example
<?php
$arr1=array("rno"=>11,"marks"=>50);
$arr2=array("rno"=>22,"marks"=>60);
$arrs=array(
"Manav"=>$arr1,
"Ravi"=>$arr2
);
foreach ($arrs as $key=>$val){
echo "name : " . $key . " ";
foreach ($val as $i=>$j){
echo $i . "->" .$j . " ";
}
echo "
";
}
?>Output
This will produce following result −
name : Manav rno->11 marks->50 name : Ravi rno->22 marks->60
This Example has associative array with each value as indexed array
Example
<?php
$arr1=array("PHP","Java","Python");
$arr2=array("Oracle","MySQL","SQLite");
$arrs=array(
"Langs"=>$arr1,
"DB"=>$arr2
);
foreach ($arrs as $key=>$val){
echo $key . ": ";
for ($i=0; $i < count($val); $i++){
echo $val[$i] . " ";
}
echo "
";
}
?>Output
This will produce following result −
Langs: PHP Java Python DB: Oracle MySQL SQLite
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