How to convert string to array type in php

Conversion method: 1. Add the target type "(array)" enclosed in brackets before the string; 2. Use for to traverse the string and store the characters into an empty array. The syntax "for( $i=0;$i

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

php will string (string ) Method of converting to array type

Method 1: Force conversion---Add the target type enclosed in parentheses before the string" (array)”

• (array): Variables can be converted into array types;

Example ：

<?php
$str="www.php.cn";
var_dump($str);
$arr=(array)$str;
var_dump($arr);
?>

Method 2: Use the for statement to traverse the string and store the characters in an empty array

<?php
$str="hello";
var_dump($str);
for($i=0;$i<strlen($str);$i++){
	$arr[]=$str[$i];
}
var_dump($arr);
?>

In PHP, strings can be used as arrays (so strings can also be looped like arrays).

The following are relevant instructions from the official PHP user manual:

The characters in the string can start with 0, and use square brackets similar to the array structure to contain the corresponding numbers. To search and modify, such as $str[42], you can think of the string as an array, so that you can take out a character at the specified position.

Method 3: Use str_split() function

str_split() function splits the string into an array according to the specified length, syntax format:

str_split(string,length)

• string Required. Specifies the string to be split.

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

<?php
$str="Hello";
$arr=str_split($str);
var_dump($arr);
?>

If length is less than 1, the str_split() function will return FALSE. If length is greater than the length of the string, the entire string will be returned as the only element of the array.

<?php
$str="Hello";
$arr=str_split($str,5);
var_dump($arr);
?>

Method 4: Use the explode() function

The explode() function can split the string according to specific delimiters into several parts.

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 returns it. The syntax format is as follows:

explode(separator,string,limit)

The parameter description is as follows:

• separator: the separator character used to split the string;
• string: the string that needs to be split;
• limit: Optional parameter, which 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 element, the last element contains the remainder of $string;
  • If $limit is not empty and is a negative number, all elements except the last $limit elements are returned;
  • If $limit is 0, it will be treated as 1;
  • If $limit is empty, it means returning all array elements.

Example:

<?php
$str="www.php.cn";
$arr=explode(".",$str);
var_dump($arr);
?>

Recommended learning: "PHP Video Tutorial"

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