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Php popen () function

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(PHP 3, PHP 4 , PHP 5)

popen -- Opens process file pointer


resource popen ( string command, string mode )

Opens a pipe to a process executed by forking the command given by command.

Returns a file pointer identical to that returned by fopen(), except that it is unidirectional (may only be used for reading or writing) and must be closed with pclose(). This pointer may be used with fgets(), fgetss(), and fwrite().

If an error occurs, returns FALSE.

Note: If you're looking for bi-directional support (two-way), use proc_open().

Example 1. popen() example

= popen("/bin/ls", "r");

If the command to be executed could not be found, a valid resource is returned. This may seem odd, but makes sense; it allows you to access any error message returned by the shell:


/* Add redirection so we can get stderr. */
$handle = popen('/path/to/spooge 2>&1', 'r');
"'$handle'; " . gettype($handle) . "\n";
$read = fread($handle, 2096);

Note: When safe mode is enabled, you can only execute executables within the safe_mode_exec_dir. For practical reasons it is currently not allowed to have .. components in the path to the executable.


With safe mode enabled, all words following the initial command string are treated as a single argument. Thus, echo y | echo x becomes echo "y | echo x".

See also pclose(), fopen(), and proc_open().

Php popen Function syntax tag

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Php popen syntax tutorial

php tutorial guide and code design are for easy learning and programming. The code practice section provided at the top is for practising of this syntax. Use the code section up to practice your php programming online. Learning php is very easy, all you need is to use the examples on this site and practice them to perfect your skills.

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