PHP Array Instance _php example

As a C + + programmer, in the process of PHP development, the PHP array produced some confusion, and C + + array has a similar place, there are some differences, the following is a comprehensive analysis of the PHP array and its corresponding data types in C + + and the difference and contact.

Classification of arrays:

1, the numerical array: Also called the index array, that is, the number (starting from 0) as an array subscript. The equivalent vector in C + +.

2. Associative array: Subscript as an array of strings. Equivalent to the map in C + +.

3. Multidimensional array: Each element in an array is also an array. Each element in its child array can also be an array.

The declaration of an array:

1. Numerical array

A, in the following example, the number ID key is assigned automatically.

$names = Array ("Peter", "Joe", "Lily");
b, in the following example, we manually assign the number ID key.

$names [0] = "Peter";
$names [1] = "Joe";
$names [2] = "Lily";

You can use these ID keys in your scripts:

<?php 
$names [0] = "Peter"; 
$names [1] = "Joe"; 
$names [2] = "Lily"; 
echo $names [0]. "and". $names [1]. "Are". $names [2]. "' S neighbors "; 
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2. Associative array:

Example 1

$ages = Array ("Peter" =>32, "Joe" =>30, "Lily" =>28);

Example 2

This example is the same as Example 1 and is just another way to create an array.

$ages ["Peter"] = "the"; 
$ages ["Joe"] = "30"; 

To use an associative array in a script:

<?php 
$ages ["Peter"] = "the"; 
$ages ["Joe"] = "a"; 
$ages ["Lily"] = "a"; 
Echo ' Peter is '. $ages ["Peter"]. "Years old."; 
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Above script output:

Peter is years old.

3, multidimensional array:

In this example, we created a multidimensional array with the auto assign number ID key:

$families = array 
{ 
"Griffin" =>array 
{" 
Peter", 
"Lois", 
"Megan" 
}, 
" Quagmire "=>array 
{" 
Glenn " 
}, 
" Brown "=>array 
{" 
Cleveland ", 
" Loretta " , 
"Junior" 
} 
}; 

Above code output:

Is Megan a part of the Griffin family?

1, for Loop traversal

The For loop can only traverse an indexed array.

<?php 
$names = Array ("Peter", "Joe", "Lily"); 
For ($id =0 $id <count ($names); + + $id) 
{ 
echo $names [$id]; 
} 

2, foreach Traversal

That is, you can traverse an indexed array, or you can traverse an associative array

Traversing an indexed array

foreach (array_expression as $value) 
{ 
loop body; 
} 
Traverses the associative array 
foreach (array_expression as $key => $value) 
{the 
loop body; 

A, one-dimensional array traversal

Indexed arrays

<?php 
$contact = Array ("Li MoU", "xx Company", "abc@xx.com"); 
foreach ($contact as $value) 
{ 
echo $value; 
} 
? > 
<?php 
$contact = Array ("name" => "Li MoU", "Company" => "xx Company", "Mailbox" => "abc@xx.com"); 
foreach ($contact as $key => $value) 
{ 
echo $key. ":". $value; 
} 

B, multidimensional array traversal

<?php 
$wage = Array ( 
"Marketing" =array ( 
1, "Li", "Marketing Manager", 8000), 
array (2, "King", "Market commissioner", 5000), 
Array (3, "Liu MoU", "Market commissioner", 7000) 
), 
"product Department" =array ( 
Array (1, "Lee", "Product Manager", 9000), 
Array (2, "Wang MoU", " Product Specialist ", 6000", 
Array (3, "Liu MoU", "Product Commissioner", 5000) 
), 
"accounts Department" =array ( 
Array (1, "Li MoU", "Account Manager", 7000), 
Array (2, "Wang MoU", "Account Officer", 6000), 
array (3, "Liu MoU", "Account Commissioner", 5000)) 
; 
foreach ($wage as $section => $table) 
{ 
echo $section. " Department personnel as follows "; 
foreach ($table as $row) 
{ 
foreach ($row as $value) 
{ 
echo $value; 
}}}// 
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The above is a small series to introduce the example of PHP array of examples, I hope to help.