PHP string to array type conversion

PHP is an excellent programming language that is widely used in web development. String to array is a common data type conversion operation. This article will introduce string to array type conversion in PHP.

1. Use the explode function

The explode function is a function in PHP used to split a string into an array. Its syntax is:

array explode ( string $delimiter , string $string [, int $limit = PHP_INT_MAX ] )

Among them, $delimiter represents the delimiter. , $string represents the string to be split, $limit represents the maximum number of array elements (default is PHP_INT_MAX).

For example, suppose we have a comma-delimited string like this:

$str = "apple,banana,orange";

Now we want to convert it to an array, we can write it like this:

$arr = explode(",", $str);

In this way, $ arr becomes an array containing three elements, namely "apple", "banana" and "orange".

2. Use the str_split function

The str_split function is a function in PHP used to convert a string into a character array. Its syntax is:

array str_split ( string $string [, int $split_length = 1 ] )

Among them, $string Represents the string to be converted, $split_length represents the length of each array element (default is 1).

For example, suppose we have a string like this:

$str = "Hello World";

Now we want to convert it into an array, we can write it like this:

$arr = str_split($str);

In this way, $arr becomes An array containing 11 elements, namely "H", "e", "l", "l", "o", " ", "W", "o", "r", "l", "d".

3. Use the preg_split function

The preg_split function is a function in PHP used to split strings into arrays according to regular expressions. Its syntax is:

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

Among them, $ pattern represents the regular expression to be matched, $subject represents the string to be split, $limit represents the maximum number of array elements (the default is -1, that is, no limit), and $flags represents the matching method (the default is 0).

For example, suppose we have a string separated by spaces and commas like this:

$str = "apple,orange banana grape";

Now we want to separate it by spaces and commas, we can write it like this:

$arr = preg_split("/[s,]+/", $str);

In this way, $arr becomes an array containing four elements, namely "apple", "orange", "banana" and "grape".

Summary:

In PHP, the operation of converting a string to an array is very common, and can usually be completed using functions such as explode, str_split and preg_split. The difference between different functions lies in the different splitting methods. You need to choose the function that suits you according to the usage scenario.

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