Mobile App Interface Programming technology-learning to implement PHP advanced arrays

• Array creation, initialization

<?phpCreate an array variable, arr, and try to create an indexed array/** * Without the initial value of the creation. Give value after creation * Note: The subscript must be an integer */  $arr=Array();$arr[0] =' Boss ';$arr[1] =' Dick ';if(isset($arr) {Print_r ($arr);}/** * with initial value creation * /  //Can be double-cited, or single-quote, array is starting from 0$arr 2=Array("Boss",' Dick ');if(isset($arr 2) {Print_r ($arr 2);}//Left is key, right is key value$arr 3=Array(' 0 '=' Boss ',' 2 '=' Old three ',' 1 '=' Dick ');if(isset($arr 3) {Print_r ($arr 3);}?>

• Using the value of an array

<?php//从数组变量$arr中，读取键为0的值$arr = array(‘老大‘,‘老二‘);//$arr0 = $arr[‘0‘];$arr0 = $arr[0];if( isset($arr0) ) {print_r($arr0);}?>

• Print array of data

//directly via index access   $arr  = array  ( ' Zhang San ' ,  ' John Doe ' ,  ' King II ' ); for  ( $i  = 0 ;  $i  < 3 ;  $i  + +) {echo  $ Arr  [ $i ]. ; }?>    

//through the Foreach loop to access the values in the array  <?php   $arr  =  Array  ( ' i '  => "I" ,  ' love '  => ' ai ' ,  ' u '  =>); if  (isset  ( $arr )) {foreach  ( $arr   As   $key  => $value ) {echo   $value .      ; }}?>   

• Summarize

  The PHP array is divided into indexed array associative arrays

An associative array is an array of key values that are strings

Example of a foreach example in the previous example.

<?
php$arr = array( ‘wo‘=>"我", ‘love‘=>‘爱‘, ‘li‘=>‘莉‘ ); if(isset($arr)) { foreach($arr as $key=>$value) { print_r($value); //echo $value; } }?>

• Associative array creation, initialization

<?
php//$arr = array(‘apple‘=>‘苹果‘);$arrarray();$arr[‘apple‘‘苹果‘;ifisset($arr) ) {print_r($arr);}?>

• Associate an array reference (use the name of the array variable followed by the Bracket + key to access the values in the array.) The key is enclosed in either a single or double argument.

  )

<?php$arrarray(‘apple‘=>"苹果",‘banana‘=>"香蕉",‘pineapple‘=>"菠萝");$arr0$arr[‘apple‘];ifisset($arr0) ) {print_r($arr0);}?
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Mobile App Interface Programming technology-learning to implement PHP advanced arrays