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/** * No initial value created, given value after creation * Note: The subscript must be an integer */  $arr=Array();$arr[0] =' Boss ';$arr[1] =' Dick ';if(isset($arr) {Print_r ($arr);}/** * with initial value creation * /  //Use double quotation marks, or single quotes, array is starting from 0$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 through index access   $arr  = array  ( ' Zhang San ' ,  ' John Doe ' ,  ' King II ' ); for  ( $i  = 0 ;  $i  < 3 ;  $i  + +) {echo  $ Arr  [ $i ]. ; }?>    

//accesses the values in the array through a foreach Loop  <?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

For example, an example of foreach in the previous example.

<?php   $arr  = array  ( ' wo '  =>< Span class= "hljs-string" > "I" ,  ' love '  => ' AI '     ,  => ' Liz ' ); 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);}?>

• An associative array reference that accesses the values in the array with the name of the array variable followed by the brackets + key, surrounded by single or double quotation marks. )

<?php$arrarray(‘apple‘=>"苹果",‘banana‘=>"香蕉",‘pineapple‘=>"菠萝");$arr0$arr[‘apple‘];ifisset($arr0) ) {print_r($arr0);}?>

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