Android programmers learn PHP development (19)-array (1) Basic concepts and definitions-PhpStorm

PHP arrays are much more powerful than arrays in other languages. let's take a look at the basic concepts of arrays and the definition of arrays: PHP arrays are much more powerful than arrays in other languages, next, let's take a look at the basic concepts of arrays and the definition of arrays:

 "111111", "two" => "222222"); * where one and two are key (key name), 111111 and 222222 are value (value, also called key value) */echo "---------- index array: the subscript is an integer ----------
"; $ Arr [0] = 1; $ arr [1] = 2; $ arr [2] = 3; print_r ($ arr); // print the result: array ([0] => 1 [1] => 2 [2] => 3) echo"
"; Echo" ---------- join array: subscript is a string ----------
"; $ Arr1 ['one'] = 1; $ arr1 ['two'] = 2; $ arr1 ['Three '] = 3; print_r ($ arr1 ); // print the result: Array ([one] => 1 [two] => 2 [three] => 3) echo"
"; Echo" ---------- array Demo ----------
"; $ Arr2 = $ arr + $ arr1; print_r ($ arr2); echo"
"; Echo" ---------- array Demo 2 ----------
"; $ Arr3 [] = 1; $ arr3 [] = 2; $ arr3 [] = 3; $ arr3 [] = 4; print_r ($ arr3); echo"
";/***
The result of the label function is formatted and output, that is, printed according to the prototype. It is easier to read. * Echo'
';     *     print_r($arr);     *     echo '
'; */Echo "---------- array Demo 3 ----------
"; $ Arr4 = array (); for ($ I = 0; $ I <10; $ I ++) {$ arr4 [] = $ I * $ I ;} echo'
';    print_r($arr4);    echo '
';/* Print the result: array ([0] => 0 [1] => 1 [2] => 4 [3] => 9 [4] => 16 [5] => 25 [6] => 36 [7] => 49 [8] => 64 [9] => 81) */echo "---------- array Demo 4 ----------
"; $ Arr5 = array (); for ($ I = 0; $ I <10; $ I ++) {// echo $ I ."
"; If ($ I = 4) {$ arr5 ['Andy Lau '] =" Obama ";} if ($ I = 7) {$ arr5 [-100] = 6666;} $ arr5 [] = $ I * $ I;} echo'
';    print_r($arr5);    echo '
';/* Print the result: array ([0] => 0 [1] => 1 [2] => 4 [3] => 9 [Andy Lau] => Ouba [4] => 16 [5] => 25 [6] => 36 [-100] => 6666 [7] => 49 [8] => 64 [9] => 81) * // ** The following are several ways to define an array: */echo "---------- array Demo 5 ----------
"; $ Arr6 = array (1, 2, 3, 4, 5, 6); $ arr7 = array (" one "," two "," three "); $ arr8 = array (0 => "aaa", 1 => "bbb", 2 => "ccc"); $ arr9 = array ("aaa ", 6 => "bbb", "ccc"); $ arr10 = array ("name" => "wang", "age" => 20 );
The above is the basic concepts and definitions of PHP Development (19)-array (1)-PhpStorm content for Android programmers. For more information, see PHP Chinese website (www.php1.cn )!