How to declare an array in php?
##There are two main ways to declare arrays in PHP: one One is to declare an array using the array() function, and the other is to declare an array directly by assigning values ??to the array elements. (What is a PHP array?)The way to declare an array using the array() function is as follows:
array array([mixed ...])
The syntax of the parameter mixed is key=>value, Use commas to separate multiple mixed parameters to define indexes and values ??respectively. The index can be a number or a string. If the index is omitted, an integer index starting from 0 is automatically generated. If the index is an integer, then the next index generated will be the largest integer index so far +1. If two identical indexes are defined, the later index will overwrite the previous index.
The data type of each data element in the array can be different, or it can be an array type. When mixed is an array type, it is a two-dimensional array (we will have details about the declaration of two-digit arrays later. explain).
When using the array() function to declare an array, the array subscript can be either a numeric index or an associative index. Use "=>" to connect subscripts and array element values, and use commas to separate different array elements!
Applying the array() function to define an array is more flexible. Only the array element values ??can be given in the function body instead of the key values. For example:
<?php
$array = array("asp","PHP","JSP"); //定義數(shù)組
print_r($array); //輸出數(shù)組元素
?>The output result is:
PHP provides the array() function to create arrays. When using the data of one of the elements, you can directly use their order in the number to get the value. This order is called the subscript of the array. For example:
<?php
$array = array("asp","PHP","JSP"); //定義數(shù)組
echo $array[1] //輸出數(shù)組元素的第二個下標值
?>The output result is:
The following declares the array through the array() function. Example code:
<?php
header("Content-Type:text/html; charset=utf-8");
$array = array("1"=>"PHP","2"=>"中","3"=>"文","4"=>"網(wǎng)"); //聲明數(shù)組
print_r($array); //輸出數(shù)組元素
echo "<br>";
echo $array[1]; //輸出數(shù)組元素的值
echo $array[2]; //輸出數(shù)組元素的值
echo $array[3]; //輸出數(shù)組元素的值
echo $array[4]; //輸出數(shù)組元素的值
?>The output result is:
## Another more flexible way to declare an array in #PHP is to directly assign values ??to array elements.
In order to deepen the understanding of this array declaration method, the following is a specific example to explain the array declaration method. The sample code is as follows:
<?php
header("Content-Type:text/html; charset=utf-8");
$array[1]="PHP";
$array[2]="中";
$array[3]="文";
$array[4]="網(wǎng)";
print_r($array); //輸出所創(chuàng)建數(shù)組的結(jié)構(gòu)
?>The output result is:
Note: When declaring an array by directly assigning values ??to array elements, the array names in the same array element are required to be the same.
【
Related tutorial recommendations】1. Relevant topic recommendations: "
php array (Array) Special Topic》2. Related video course recommendations: "
Creation and Access of PHP Arrays: 3 Creation Methods and 2 Access method》
The above is the detailed content of How to declare an array in php: two ways to declare an array. For more information, please follow other related articles on the PHP Chinese website!
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