Where are php scripts executed?
PHP is a compiled language since PHP 4.0 Show The idea of what is a compiler seems to be a subject that causes great confusion. Some people assume that a compiler is a program that converts source code in one language into an executable program. The definition of what is a compiler is actually broader than that. A compiler is a program that transforms source code into another representation of the code. The target representation is often machine code, but it may as well be source code in another language or even in the same language. PHP became a compiled language in the year 2000, when PHP 4 was released for the first time. Until version 3, PHP source code was parsed and executed right away by the PHP interpreter. PHP 4 introduced the the Zend engine. This engine splits the processing of PHP code into several phases. The first phase parses PHP source code and generates a binary representation of the PHP code known as Zend opcodes. Opcodes are sets of instructions similar to Java bytecodes. These opcodes are stored in memory. The second phase of Zend engine processing consists in executing the generated opcodes. Form more information go to http://www.phpclasses.org/blog/post/117-PHP-compiler-performance.html Executing PHP filesThere are three different ways of supplying the CLI SAPI with PHP code to be executed:
You cannot combine any of the three ways to execute code. As with every shell application, the PHP binary accepts a number of arguments; however, the PHP script can also receive further
arguments. The number of arguments that can be passed to your script is not limited by PHP (and although the shell has a limit to the number of characters which can be passed, this is not in general likely to be hit). The arguments passed to the script are available in the global array $argv. The first index (zero) always contains the name of the script as called from the command line. Note that,
if the code is executed in-line using the command line switch -r, the value of $argv[0] will be A second global variable, $argc, contains the number of elements in the $argv array (not the number of arguments passed to the script). As long as the arguments to be passed to the script do not start with the # This will not execute the given code but will show the PHP usage $ php -r 'var_dump($argv);' -h Usage: php [options] [-f] However, on Unix systems there's another way of using PHP for shell scripting: make the first line of the script start with Example #1 Execute PHP script as shell script
Assuming this file is named test in the current directory, it is now possible to do the following: $ chmod +x test $ ./test -h -- foo array(4) { [0]=> string(6) "./test" [1]=> string(2) "-h" [2]=> string(2) "--" [3]=> string(3) "foo" } As can
be seen, in this case no special care needs to be taken when passing parameters starting with The PHP executable can be used to run PHP scripts absolutely independent of the web server. On Unix systems, the special Example #2 Script intended to be run from command line (script.php)
The script above includes the Unix shebang first line to indicate that this file should be run by PHP. We are working with a CLI version here, so no HTTP headers will be output. The program first checks that there is the required one argument (in addition to the script name, which is also counted). If not, or if the argument was --help, -help, -h or -?, the help message is printed out, using $argv[0] to dynamically print the script name as typed on the command line. Otherwise, the argument is echoed out exactly as received. To run the above script on Unix, it must be made executable, and called simply as script.php echothis or script.php -h. On Windows, a batch file similar to the following can be created for this task: Example #3 Batch file to run a command line PHP script (script.bat) @echo OFF "C:\php\php.exe" script.php %* Assuming the above program is named script.php, and the CLI php.exe is in C:\php\php.exe, this batch file will run it, passing on all appended options: script.bat echothis or script.bat -h. See also the Readline extension documentation for more functions which can be used to enhance command line applications in PHP. On Windows, PHP can be configured to run without the need to supply the C:\php\php.exe or the
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Is PHP scripts are executed on the server?PHP is a server side scripting language. This means that it is executed on the server. The client applications do not need to have PHP installed.
How is a PHP script executed?Until version 3, PHP source code was parsed and executed right away by the PHP interpreter. PHP 4 introduced the the Zend engine. This engine splits the processing of PHP code into several phases. The first phase parses PHP source code and generates a binary representation of the PHP code known as Zend opcodes.
Where do I run PHP commands?You just follow the steps to run PHP program using command line.. Open terminal or command line window.. Goto the specified folder or directory where php files are present.. Then we can run php code using the following command: php file_name.php.. Is PHP executed on the client side?The PHP is not installed on the client side, it is only on the server side. Using
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