How can I call a command line executable from within PHP?

Check out the "Program Execution functions" here :

http://www.php.net/manual/en/ref.exec.php

As well as the `backtick` execution operator :

http://www.php.net/manual/en/language.operators.execution.php

Consider exec() :

exec — Execute an external program :
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http://www.php.net/manual/en/function.exec.php

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