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Use the phpversion() or zend_version() functions to retrieve version information for PHP or the Zend engine:
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< php echo "PHP version: " phpversion() " \n"; echo "Zend version: " zend_version() " \n"; >
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Or, call phpversion() with the extension name as argument to retrieve version information for that extension:
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12: Working with Exceptions and Other Miscellanea
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< php echo "PHP MySQL library version: " phpversion('mysql') " \n"; echo "PHP EXIF library version: " phpversion('exif') " \n"; >
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The phpversion() function is your one-stop shop to retrieve version information on PHP itself, or any of its extensions Simply call phpversion() to get the current PHP version number, and add an optional extension name argument to get the version number of the corresponding extension This function is often used in combination with the version_compare() function to check for a minimum PHP version prior to application installation or before calling a relatively new function, as in the next listing:
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< php // check version if (!version_compare(phpversion(), '520', '>=')) { die ("You need PHP 520 or better to run this script Exiting"); } >
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For detailed information on your current PHP build, call phpinfo(), as shown here:
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< php phpinfo(); >
You can also pass phpinfo() an additional parameter to customize the output further, grabbing (for example) information on only environment variables, loaded modules, or EGPCS (Environment, Get, Post, Cookies, Server) variables
128 Altering PHP s Run-Time Configuration
Problem
You want to retrieve or alter the value of a PHP configuration variable at run time
PHP Programming Solutions
Solution
Use the ini_get() function to retrieve the value of a PHP configuration variable:
< php // get the value of a PHP configuration variable echo "The current include path is: " ini_get('include_path'); >
Use the ini_set() function to set or alter the value of a PHP configuration variable at run time:
< php // alter the value of a PHP configuration variable ini_set('max_execution_time', 600); >
Comments
PHP s ini_set() and ini_get() functions are commonly used to retrieve or alter the value of PHP variables, such as the script execution timeout or the maximum file upload size, on a per-script basis at run time The ini_get() function accepts the name of a PHP variable and returns its value to the caller; the ini_set() function accepts a variable name and value, and sets the variable to that value The previous listings illustrate how they may be used Note that settings changed via ini_set() are only valid for the duration of the script in which they are made; once the script terminates, the global value of the variable, as set in the phpini configuration file, again takes precedence
129 Checking Loaded Extensions
Problem
You want to check if a particular PHP extension is loaded before using it in a script
Solution
Use PHP s extension_loaded() function:
< php // check if extension is loaded if (!extension_loaded("mysqli")) {
12: Working with Exceptions and Other Miscellanea
die ("MySQLi extension not loaded, terminating"); } // if loaded, attempt connection $conn = @mysqli_connect("localhost", "user", "pass", "db1") or die("Unable to connect"); unset($conn); >
Comments
To avoid nasty error messages about undefined functions, it s always a good idea to check for the presence of a particular extension before using it in your scripts PHP s extension_loaded() function accepts the name of an extension, and returns a Boolean value indicating whether or not it is available for use The previous listing illustrates an example of how it may be used to check for the presence of ext/ mysqli, terminating the script if the extension is not loaded
NOTE
The extension_loaded() function must be supplied with the internal PHP name for an extension, rather than its file name (the two are often different, especially on Windows systems) You can obtain this list of names by calling the PHP binary with the -m option
1210 Using Strict Standards
Problem
You want to verify if a PHP script is written for maximum interoperability and forward compatibility
Solution
Set PHP s error reporting level to E_STRICT:
< php // turn on strict standards error_reporting(E_STRICT); // execute some code echo date("Y-m-d", mktime()); >
PHP Programming Solutions
Comments
When set to E_STRICT, PHP inspects your code at run time and automatically generates recommendations about how it may be improved Using E_STRICT can often provide a heads-up on functions that will break in a future version of PHP, and, as such, using it is recommended to improve the long-term maintainability of your code The previous listing illustrates this clearly When the script is executed, PHP will generate a notice about the inappropriate use of mktime(), and instead suggest using the time() function Try it for yourself and see you ll be surprised by how much your code can be improved!
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