PHP Array in detail, an array of detailed _php tutorials

PHP array, detailed array

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";  These ID keys can be used in scripts:  
 
   php      $names[0] = "Peter";       $names [1] = "Joe";       $names [2] = "Lily";       Echo $names [0]. " and ". $names [1]. " Is ". $names [2]. "' S neighbors ";   /*  */?>  

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.   $ages ["Peter"] = "+";   $ages ["Joe"] = "a";   $ages ["Lily"] = "";  Use associative arrays in scripts:  
 
   php      $ages["Peter"] = "       +"; $ages ["Joe"] = "a";       $ages ["Lily"] = "";       Echo "Peter is". $ages ["Peter"]. " Years old. " ;   /*  *   /?> above script output  :

3. Multidimensional Arrays:

In this example, we created a multidimensional array with an auto-assigned numeric ID key:   $families Array   {      "Griffin" = =array          {"Peter",          "Lois",          "Megan"       },      "quagmire" = =array          {"Glenn"      },      " Brown "= =Array      {          " Cleveland ",          " Loretta ",          " Junior "      }  };   Echo $families [' Griffin '] [2]. "A part of the Griffin family?" ;  The above code output: is  Megan apart of the Griffin family?  

Array traversal

1, the For loop traversal for loop can only traverse an indexed array. 
 Php$names=Array("Peter", "Joe", "Lily");  for($id= 0;$id<Count($names);++$id)      {          Echo $names[$id]; }  ?> 2, a foreach traversal can traverse an indexed array, or it can traverse an array of indexesforeach(array_expression as $value) {loop body; } Traversal associative arrayforeach(array_expression as $key=$value) {loop body; } A, one-dimensional array traversal index array
 Php$contact=Array("Li MoU", "xx Company", "abc@xx.com"); foreach($contact  as $value)      {          Echo $value; }  ?>
 Php$contact=Array("Name" = "Li MoU", "Company" = "xx Company", "Mailbox" = "abc@xx.com"); foreach($contact  as $key=$value)      {          Echo $key.":".$value; }  ?>B, multidimensional array traversal
 Php$wage=Array(          "Marketing Department" =Array(              Array(1, "Li MoU", "Marketing Manager", 8000),Array(2, "Wang MoU", "Market commissioner", 5000),Array(3, "Liu MoU", "Market commissioner", 7000)          ), "product Department" =Array(              Array(1, "Lee", "Product Manager", 9000),Array(2, "Wang MoU", "Product Specialist", 6000),Array(3, "Liu MoU", "Product Specialist", 5000)          ), "accounts Department" =Array(              Array(1, "Lee", "Account Manager", 7000),Array(2, "Wang MoU", "Account Officer", 6000),Array(3, "Liu MoU", "Account Officer", 5000)          )      ); foreach($wage  as $section=$table)      {          Echo $section." Department personnel as follows "; foreach($table  as $row)          {              foreach($row  as $value)              {                  Echo $value; }          }      }  /*how to ask Hovertree.com*/?>

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