note 109403 modified in function.explode by googleguy
| From: | googleguy@php.net | Date: | Sat, 24 Nov 2012 20:40:50 +0000 |
| Subject: | note 109403 modified in function.explode by googleguy | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-192134@lists.php.net to get a copy of this message | ||
Explode does not parse a string by delimiters, in the sense that we expect to find tokens between a
starting and ending delimiter, but instead splits a string into parts by using a string as the
boundary of each part. Once that boundary is discovered the string is split. Whether or not that
boundary is proceeded or superseded by any data is irrelevant since the parts are determined at the
point a boundary is discovered.
For example:
<?php
var_dump(explode("/","/"));
/*
Outputs
array(2) {
[0]=>
string(0) ""
[1]=>
string(0) ""
}
*/
?>
The reason we have two empty strings here is that a boundary is discovered before any data has been
collected from the string. The boundary splits the string into two parts even though those parts are
empty.
One way to avoid getting back empty parts (if you don't care for those empty parts) is to use
array_filter on the result.
<?php
var_dump(array_filter(explode("/","/")));
/*
Outputs
array(0) {
}
*/
?>
*[This note was edited by googleguy at php dot net for clarity]*
--was--
Explode does not parse a string by delimiters, in the sense that we expect to find tokens between a
starting and ending delimiter, but instead splits a string into parts by using a string as the
boundary of each part. Once that boundary is discovered the string is split. Whether or not that
boundary is proceeded or superseded by any data is irrelevant since the parts are determined at the
point a boundary is discovered.
For example:
<?php
var_dump(explode(\"/\",\"/\"));
/*
Outputs
array(2) {
[0]=>
string(0) \"\"
[1]=>
string(0) \"\"
}
*/
?>
The reason we have two empty strings here is that a boundary is discovered before any data has been
collected from the string. The boundary splits the string into two parts even though those parts are
empty.
One way to avoid getting back empty parts (if you don\'t care for those empty parts) is to use
array_filter on the result.
<?php
var_dump(array_filter(explode(\"/\",\"/\")));
/*
Outputs
array(0) {
}
*/
?>
*[This note was edited by googleguy at php dot net for clarity]*
http://php.net/manual/en/function.explode.php