Anybody please tell me. I want know the different between the exec(), shell_exec, system() and passthru() function?
I search from php.net unable to get the answers I need.
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1As far as I can see, correct description (with differences) are provided for each on PHP webiste. uk3.php.net/execmarekful– marekful2013-11-19 13:25:50 +00:00Commented Nov 19, 2013 at 13:25
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stackoverflow.com/questions/10828707/…Krish R– Krish R2013-11-19 13:27:12 +00:00Commented Nov 19, 2013 at 13:27
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Can u sey me what is the use of passthru() ? Send me reference link which i will find my answer with exampleDeveloper– Developer2013-11-19 13:27:43 +00:00Commented Nov 19, 2013 at 13:27
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From PHP documentation for passthru: "This function should be used in place of exec() or system() when the output from the Unix command is binary data which needs to be passed directly back to the browser." uk3.php.net/manual/en/function.passthru.phpmarekful– marekful2013-11-19 13:30:22 +00:00Commented Nov 19, 2013 at 13:30
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2 Answers
execonly returns the last line of the generated output.shell_execreturns the full output of the command, when the command finished running.systemimmediately shows all output, and is used to show text.passthrualso returns output immediately, but is used for binary data.passthrudisplays raw data.
With both exec and shell_exec it is possible to handle the output yourself, while system and passthru won't let you customize it and immediately display the output.
A more detailed comparison can be found here.
2 Comments
Kellen Stuart
Would be awesome if you had an example
redanimalwar
system return false when there was an error. Does this mean when the exit code is !== 0 it will return false? So I do not have to actually check the $retval if I just want to check of the command suceeded?passthru is used for returning binary data instead of ascii. A typical example is where an image manipulation program is returning an image instead of text data.
See PHP - exec() vs system() vs passthru() for more info
Also see php shell_exec() vs exec().
