PHP Part02 Arrays

Summary
PHP array
1. Array
Array processing
1. foreach
2. list
This code

Summary

Let’s arrange the array in PHP.

In addition, we will also describe the sequence processing.

If you haven’t done so last time, please refer to the following.

PHP Part01 Variables and Operations

PHP array

Array

Specify the value directly without specifying the key.The key element starts with “0” from the beginning.

Directly

$temp_array = array('A', 'B', 'C');
print ($temp_array[0]);
print ($temp_array[1]);
print ($temp_array[2]);

結果

ABC

Specify the key to store the value.

Key specification

$temp_array['A'] = 'Apple';
$temp_array['B'] = 'Strawberry';
$temp_array['C'] = 'Banana';
print ($temp_array['A']);
print ($temp_array['B']);
print ($temp_array['C']);

結果

AppleStrawberryBanana

Stores multiple key-specified values. Use “=>”.

Multiple implementations

$temp_array = [
    'aaa' => 'Apple',
    'bbb' => 'Strawberry',
    'ccc' => 'Banana'
];
print ($temp_array['aaa']);
print ($temp_array['bbb']);
print ($temp_array['ccc']);

結果

AppleStrawberryBanana

Array processing

This is a convenient control syntax that processes the data stored in the array in order.

foreach

Loops for the number of data stored in the array.

foreach

$temp_array = array('A', 'B', 'C');
foreach($temp_array as $temp){          // 配列の中身をtempへ渡す
	print($temp);                   // tempの中身が表示されます
	print("<br/>");
}

結果

A
B
C

The foreach when there is a subscript is as follows.

Subscripted array foreach

$temp_array = [
'aaa' => 'Apple',
'bbb' => 'Strawberry',
'ccc' => 'Banana'
];
//Pass the key to tempKey and the value to tempValue
foreach($temp_array as $tempkey => $tempValue){
　　// The contents of temp will be displayed
    print($tempkey.'='.$tempValue);
    print("<br/>");
}

結果

aaa=Apple
bbb=Strawberry
ccc=Banana

list

Use list if you want to receive an array from the function as a return value.

list

function array_func(){
    return array('A', 'B', 'C');
}
// Store return value array in list variable
list($a, $b, $c) = array_func();
print ($a);
print ($b);
print ($c);
print("<br/>");

結果

ABC

This code

<html>
<head>
 <title>PHP</title>
</head>
<body>
<?php
   /* 配列 */
   $temp_array = array('A', 'B', 'C');
   print ($temp_array[0]);                 // The contents of the array are displayed
   print ($temp_array[1]);                 // The contents of the array are displayed
   print ($temp_array[2]);                 // The contents of the array are displayed
   print("<br/>");

   /* key */
   $temp_array['A'] = 'Apple';
   $temp_array['B'] = 'Strawberry';
   $temp_array['C'] = 'Banana';
   print ($temp_array['A']);               // The contents of the array are displayed
   print ($temp_array['B']);               // The contents of the array are displayed
   print ($temp_array['C']);               // The contents of the array are displayed
   print("<br/>");

   /* => */
   $temp_array = [
       'aaa' => 'Apple',
       'bbb' => 'Strawberry',
       'ccc' => 'Banana'
   ];
   print ($temp_array['aaa']);             // The contents of the array are displayed
   print ($temp_array['bbb']);             // The contents of the array are displayed
   print ($temp_array['ccc']);             // The contents of the array are displayed
   print("<br/>");

   $temp_array = array('A', 'B', 'C');
   foreach($temp_array as $temp){          // Pass the contents of the array to temp
       print($temp);                       // The contents of temp are displayed
       print("<br/>");
   }

   /* foreach */
   $temp_array = [
   'aaa' => 'Apple',
   'bbb' => 'Strawberry',
   'ccc' => 'Banana'
   ];
   // Pass the key to tempKey and the value to tempValue
   foreach($temp_array as $tempkey => $tempValue){         
     // tempの中身が表示されます
       print($tempkey.'='.$tempValue);                       
       print("<br/>");
   }
   
   /* list */
   function array_func(){
       return array('A', 'B', 'C');
   }
   list($a, $b, $c) = array_func();
   print ($a);
   print ($b);
   print ($c);
   print("<br/>");

 ?>
 </body>
</html>