What are the ways to convert php to array?

How to convert an array: 1. Add the target type "(array)" enclosed in parentheses before the specified variable, the syntax is "(array) variable"; 2. Use settype() to set the variable to Array type, syntax "settype(variable, "array")"; 3. Use str_split() to convert a string into an array, syntax "str_split(string, element length)"; 4. Use explode() to convert a string For an array, the syntax is "explode (split character, string)".

The operating environment of this tutorial: windows7 system, PHP8.1 version, DELL G3 computer

php to array Several ways

#Method 1. Add the target type "(array)" enclosed in parentheses before the variable

• (array): Convert to array type;

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = &#39;hello&#39;;
var_dump($str);
$arr=(array)$str;
var_dump($arr);
?>

Method 2: Use the settype() function

settype($var,$type) function is used to set variable $var to the specified type $type.

Just set $type to ""array"" to set the variable $var to the array type.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = &#39;hello&#39;;
var_dump($str);
$arr=settype($str,"array");
var_dump($arr);
var_dump($str);
?>

Description: The settype() function will change the original variable, returning TRUE if the setting is successful, and FALSE if it fails.

Method 3. Use str_split() function--convert the string into an array

str_split() function splits the string into an array, that is, converts the string into an array is a character array.

str_split(string,length)

The parameter description is as follows:

• string Required. Specifies the string to be split.

• #length Optional. Specifies the length of each array element. The default is 1.

Example:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = &#39;hello&#39;;
var_dump($str);
$arr1=str_split($str);
var_dump($arr1);
$arr2=str_split($str,2);
var_dump($arr2);
?>

Method 4. Use the explode() function--convert the string For arrays

explode() function can split a string based on the string delimiter, that is, it splits a string into several substrings based on the delimiter, and then combines these substrings into an array and return.

explode($delimiter, $string [, $limit])

The parameter description is as follows:

• $delimiter: The delimiter character used to split the string;
• $string: The string that needs to be split;
• $limit: Optional parameter, can be empty, specifies the number of array elements to be returned;
  •             If $limit is not empty and is a positive number, the returned array contains at most $limit elements, and the last element contains the remainder of $string;
  •             If $limit is not empty and is negative, all elements except the last $limit elements are returned;
  •             If $limit is 0, it will be treated as 1;
  •           If $limit is empty, all array elements are returned.

Just set $delimiter to ' '.

Example:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = &#39;hypertext language programming&#39;;
var_dump($str);
$arr=explode(" ",$str);
var_dump($arr);
?>

Method 5. Use the preg_split() function--convert the string into an array

preg_split() function splits a string by a regular expression.

preg_split ( string $pattern , string $subject [, int $limit = -1 [, int $flags = 0 ]] )

The parameter description is as follows:

• $pattern: The pattern used for matching, that is, the regular expression.
• $subject The string to be split.
• $limit: Optional parameter. If specified, the substrings obtained by limiting the separation will be limited to at most limit, and the last substring will contain all remaining parts. When the limit value is -1, 0 or NULL, it means "no limit". It is recommended to use NULL.
• $flags: optional parameter, which has 3 values.
  • If set to PREG_SPLIT_NO_EMPTY, preg_split() will return the separated non-empty part.
  • If set to PREG_SPLIT_DELIM_CAPTURE, bracket expressions in delimited patterns will be captured and returned.
  • If set to PREG_SPLIT_OFFSET_CAPTURE, the string offset will be appended to the return for each occurrence of a match.

            Note: This will change each element in the returned array so that each element becomes an array consisting of the 0th element being the separated substring and the 1st element being the offset of the substring in the subject. .

Return value: Returns an array composed of substrings obtained after using $pattern to split the subject string.

Just set $pattern to / /.

Example:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = &#39;1 2 3 4,5 6-7 8=9&#39;;
var_dump($str);
$arr=preg_split(&#39;/ /&#39;, $str, -1, PREG_SPLIT_OFFSET_CAPTURE);
var_dump($arr);
?>

方法6：使用get_object_vars()函数--将对象转化为数组

get_object_vars()返回由对象属性组成的关联数组。

语法：

get_object_vars ($obj)

返回由 obj 指定的对象中定义的属性组成的关联数组。

示例：

<?php
class gfg {
    private $geeks = 0.02;
    public $for = 1;
    public $Geeks = "php";
    private $GEEKS;
    static $e;
     
    public function example() {
        var_dump(get_object_vars($this));
    }
}
 

$example = new gfg;
 
var_dump(get_object_vars($example));
  
$example->example();
  
?>

方法7：使用json_encode()和json_decode()函数--将对象转化为数组

使用json_encode函数将对象转换为json数据，再使用json_decode函数将json数据转换为数组。

<?php
class gfg {
    public  $geeks = 0.02;
    public $for = 1;
    public $Geeks = "php";
    public  $GEEKS;
    public  $e;
}
 

$example = new gfg;
 
var_dump(json_decode(json_encode($example),TRUE));

?>

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