PHP Array Example _php instance

As a C + + programmer, in the process of PHP development, the PHP array generated some confusion, and C + + arrays have similar places, there are some differences, the following comprehensive analysis of the PHP array and its corresponding data types in C + + and the relationship between.

Classification of arrays:

1, array of values: Also known as the index array, that is, the number (starting from 0) as an array subscript. Equivalent to a vector in C + +.

2. Associative array: Subscript the array as a string. Corresponds to a map in C + +.

3. Multidimensional arrays: Each element in an array is also an array. Each element in its sub-array can also be an array.

Declaration of the array:

1. Array of values

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

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

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

You can use these ID keys in your script:

2. Associative arrays:

Example 1

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

Example 2

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

To use associative arrays in a script:

The above script output:

Peter is the years old.

3. Multidimensional Arrays:

In this example, we created a multidimensional array with an auto-assigned numeric ID key:

The 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
 
   
 
  

2. Foreach Traversal

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

Iterating through an indexed array

A, one-dimensional array traversal

Indexed array

B, multidimensional array traversal

The above is a small series to introduce you to the PHP array of examples of the detailed, I hope to be helpful to everyone.

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