Android Programmers Learn PHP development (19)-Arrays (1) Basic concepts and definitions of the way-phpstorm

PHP arrays are much more powerful than arrays of other languages, let's look at the basic concepts of arrays and how they are defined:

<?php/** * Array * Direct Assignment declaration array, as follows: * $arr = Array ("One" = "111111", "one" = "222222");    * One, two is key (key name), 111111, 222222 is the value (values, also called key value)/echo "----------Index array: Subscript is an integer----------<br>";    $arr [0] = 1;    $arr [1] = 2;    $arr [2] = 3; Print_r ($arr);    Printing results: Array ([0] = 1 [1] = 2 [2] + 3) echo "<br>";    echo "----------Associative array: subscript is string----------<br>";    $arr 1[' one '] = 1;    $arr 1[' "] = 2;    $arr 1[' three '] = 3; Print_r ($arr 1);    Print Result: Array ([one] = 1 [One] = 2 [three] + 3) echo "<br>";    echo "----------array Demo----------<br>";    $arr 2 = $arr + $arr 1;    Print_r ($arr 2);    echo "<br>";    echo "----------array Demo 2----------<br>";    $arr 3[] = 1;    $arr 3[] = 2;    $arr 3[] = 3;    $arr 3[] = 4;    Print_r ($arr 3);    echo "<br>"; /** * <pre> label function results formatted output, that is, printed by prototype.     It's more convenient to read.     * echo ' <pre> ';     * Print_r ($arr); * echo ' &LT;/PRE> ';    */echo "----------array Demo 3----------<br>";    $arr 4 = array ();    for ($i =0; $i <10; $i + +) {$arr 4[] = $i * $i;    } echo ' <pre> ';    Print_r ($arr 4);    Echo ' </pre> '; /* Print Result: Array ([0] = 0 [1] = 1 [2] = 4 [3] = 9 [     4] [+] [5] = [6] = [7] = [8] = [9] = 81)    */echo "----------array Demo 4----------<br>";    $arr 5 = array (); for ($i =0; $i <10; $i + +) {//echo $i. "        <br> ";        if ($i = = 4) {$arr 5[' andy Lau '] = "Aubagne";        } if ($i = = 7) {$arr 5[-100] = 6666;    } $arr 5[] = $i * $i;    } echo ' <pre> ';    Print_r ($arr 5);    Echo ' </pre> '; /* Print Result: Array ([0] = 0 [1] = 1 [2] = 4 [3] + 9 [andy Lau] = Aubagne [4] =&Gt [5] [+] [6] = [ -100] = [7] = 6666 [8] =&G T [9] = 81) *//** * Following are several ways to define arrays: */echo "----------array Demo 5----------<b    R> ";    $arr 6 = array (1,2,3,4,5,6);    $arr 7 = Array ("One", "one", "three");    $arr 8 = Array (0=> "AAA",1=> "BBB",2=> "CCC");    $arr 9 = Array ("AAA",6=> "BBB", "CCC"); $arr = Array ("name" = "Wang", "Age" =>20);

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