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Split string into array by a regular expression

suggest change 
$string = "0| PHP 1| CSS 2| HTML 3| AJAX 4| JSON";

//[0-9]: Any single character in the range 0 to 9
// +   : One or more of 0 to 9
$array = preg_split("/[0-9]+\|/", $string, -1, PREG_SPLIT_NO_EMPTY);
//Or
// []  : Character class
// \d  : Any digit
//  +  : One or more of Any digit
$array = preg_split("/[\d]+\|/", $string, -1, PREG_SPLIT_NO_EMPTY);

Output: 

Array
(
    [0] =>  PHP
    [1] =>  CSS 
    [2] =>  HTML 
    [3] =>  AJAX 
    [4] =>  JSON
)

To split a string into a array simply pass the string and a regexp for preg_split(); to match and search, adding a third parameter (limit) allows you to set the number of “matches” to perform, the remaining string will be added to the end of the array.

The fourth parameter is (flags) here we use the PREG_SPLIT_NO_EMPTY which prevents our array from containing any empty keys / values.

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Regular expressions:
* Regular Expressions regexpPCRE
* Global RegExp match
* String matching with regular expressions
* Split string into array by a regular expression
* String replacing with regular expression
* String replace with callback
Table Of Contents
0 Getting started
1 Variables
2 Arrays
3 Functional programming
4 Types
5 Autoloading primer
6 Exception handling and error reporting
7 Working with dates and time
8 Sending email
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10 Cookies
11 Classes and objects
12 Password hashing
13 Output buffering
14 JSON
15 SOAP
16 Reflection
17 cURL
18 Dependency injection
19 XML
20 Regular expressions
21 Traits
22 Namespaces
23 Parsing HTML
24 Composer dependency manager
25 Magic methods
26 Alternative syntax for control structures
27 File handling
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29 Type hinting
30 Multi-threading extension
31 Filters, filter functions
32 Generators
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35 UTF-8
36 URLs
37 Object serialization
38 PHPDoc
39 Contributing to PHP Manual
40 String parsing
41 Loops
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46 Type juggling and non-strict comparison issues
47 Security
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50 Localization
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52 Superglobal variables
53 Unit testing
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56 Compilation errors and warning
57 Installing PHP on Windows
58 DateTime class
59 Headers manipulation
60 Performance
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62 Installing on Linux / Unix
63 Contributing to PHP Core
64 Coding conventions
65 Using MongoDB
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68 Unicode Support
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71 Hot to detect client IP address
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73 Image processing with GD
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80 Cryptography
81 PDO
82 SQLite3
83 Sockets
84 Outputting the value of a variable
85 String formatting
86 Compile PHP extensions
87 MongoDB
88 Manipulating an array
89 Executing upon an array
90 Processing multiple arrays together
91 SPL data structures
92 Comments
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97 HTTP Authentication
98 Recipies
99 BC Math Binary Calculator
100 Docker deployment
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102 APCu
103 Design patterns
104 Secure remember me
105 PHP mysqli
106 PHP built-in server
107 How to break down an URL
108 PSR
109 Contributors