Security Learning Mode
Qusetions Index 59/185
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Sometimes, it is desirable to use a third-party utility from within a PHP script to perform operations that the language does not support internally (for instance, calling a compression program to compress a file using a format that PHP does not provide an extension for). When executing system commands from PHP scripts, which of the following functions should always be used to ensure no malicious commands are injected? (Choose 2)
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