How to convert string to array in php (separated by spaces)

Conversion method: 1. Use explode(), use spaces as delimiters to split the string and convert it into an array, the syntax is "explode(" ",$str)"; 2. Use "preg_split(' / /',$str,-1,PREG_SPLIT_OFFSET_CAPTURE)" statement.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

There are three methods built into php to convert characters Convert string to array:

• str_split() function

• explode() function

• preg_split () function

Among them, the str_split() function splits the string based on the character length and passes the substring into the array

And explode() and preg_split The () function divides the string based on the specified character and passes the substring into the array.

So use the explode() and preg_split() functions to convert a string into an array with spaces as boundaries.

1. Use the explode() function

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

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

The parameter description is as follows:

• $delimiter: delimiter character used to split 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 but 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);
?>

2. Use preg_split() function

preg_split() function Split 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);
?>

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