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phpversion

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Introduction

When working with various libraries and their associated requirements, it is often necessary to know the version of current PHP parser or one of it’s packages.

This function accepts a single optional parameter in the form of extension name: phpversion('extension'). If the extension in question is installed, the function will return a string containing version value. However, if the extension not installed FALSE will be returned. If the extension name is not provided, the function will return the version of PHP parser itself.

Example 

print "Current PHP version: " . phpversion();
// Current PHP version: 7.0.8

print "Current cURL version: " . phpversion( 'curl' );
// Current cURL version: 7.0.8
// or
// false, no printed output if package is missing
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Debugging:
* Debugging
* Dumping variables
* Displaying errors
* phpinfo
* Xdebug
* phpversion
* Error Reporting use them both
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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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24 Composer dependency manager
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31 Filters, filter functions
32 Generators
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34 Constants
35 UTF-8
36 URLs
37 Object serialization
38 PHPDoc
39 Contributing to PHP Manual
40 String parsing
41 Loops
42 Control structures
43 Serialization
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46 Type juggling and non-strict comparison issues
47 Security
48 PHP MySQLi
49 Command Line Interface CLI
50 Localization
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52 Superglobal variables
53 Unit testing
54 Variable scope
55 References
56 Compilation errors and warning
57 Installing PHP on Windows
58 DateTime class
59 Headers manipulation
60 Performance
61 Common Errors
62 Installing on Linux / Unix
63 Contributing to PHP Core
64 Coding conventions
65 Using MongoDB
66 Asynchronous programming
67 Using SQLSRV
68 Unicode Support
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71 Hot to detect client IP address
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73 Image processing with GD
74 Multiprocessing
75 SOAP Server
76 Machine learning
77 Cache
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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
93 IMAP
94 Redis
95 Imagick
96 SimplXML
97 HTTP Authentication
98 Recipies
99 BC Math Binary Calculator
100 Docker deployment
101 WebSockets
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