How does the set_time_limit function in PHP affect the execution of external processes launched with exec()?

The set_time_limit function in PHP sets the maximum execution time for a script. When an external process is launched with exec(), it inherits the time limit set by set_time_limit. If the external process takes longer to execute than the time limit, it may be terminated prematurely. To ensure that the external process can run without being affected by the time limit, you can set the time limit to 0 before executing the external process and then restore the original time limit afterward. 

// Save the original time limit
$original_time_limit = ini_get('max_execution_time');

// Set the time limit to 0 (unlimited) for the external process
set_time_limit(0);

// Execute the external process
exec('your_external_process_command_here');

// Restore the original time limit
set_time_limit($original_time_limit);

Keywords

set_time_limit PHP exec() external processes execution

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