The difference between PHP functions explode and split

Objective

This is done because the two functions are similar in that they are converting strings into groups.

Explode

As can be seen from the example below, the resulting array is in a corresponding order.

The code is as follows	Copy Code
$pizza = "Piece1 piece2 piece3 piece4 piece5 piece6"; $pieces = Explode ("", $pizza); echo $pieces [0]; Piece1 echo $pieces [1]; Piece2 Example 2 $data = "Foo:*:1023:1000::/home/foo:/bin/sh"; List ($user, $pass, $uid, $gid, $gecos, $home, $shell) = Explode (":", $data); Echo $user; Foo Echo $pass; // *

Note that if the first argument is an empty string, a warning is generated.

The code is as follows	Copy Code
Var_dump (Explode (', ' asdasd ')); Warning:explode (): Empty delimiter In/tmp/e80c9663-e392-4f81-8347-35726052678f/code on line 3 BOOL (FALSE) Split

(PHP 4, PHP 5)

Split-the string into an array with a regular expression

Note that PHP 7 is not on the top, which means that the split function does not support PHP 7.

The code is as follows

Copy Code

$date = "04/30/1973"; List ($month, $day, $year) = Split (' [/.-] ', $date); echo "Month: $month; Day: $day; Year: $year <br/>\n "; An error under PHP 7 Fatal error:uncaught error:call to undefined function split () In/tmp/4d38c290-b4cb-43f5-846a-9fa90784a090/code:4 Stack Trace: #0 {main} Thrown In/tmp/4d38c290-b4cb-43f5-846a-9fa90784a090/code on line 4 Return to normal under PHP 5.6 month:04; day:30; year:1973

The first argument to split is a regular expression, which means that if you want to match a special character, you need to escape it.

The code is as follows	Copy Code
$arr = ' 2016\8\11 '; $rearr = Split (' [/\] ', $arr); Var_dump ($rearr) /* Array (3) { [0]=> String (4) "2016" [1]=> String (1) "8" [2]=> String (2) "11" } */

It is also because you want to use the syntax of regular expression pattern, the search speed is not very fast.

The Preg_split () function uses Perl-compatible regular expression syntax, and is usually a faster alternative than split (). If you do not need the power of regular expressions, use explode () faster, so that you do not incur the waste of the regular expression engine

The potential for efficiency is caused by the fact that PHP 7 has simply given up the function.