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Editorial Team
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Asked: 2026-05-15T01:08:02+00:00

I’m looking for a list of built in PHP functions that a programmer could

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I’m looking for a list of built in PHP functions that a programmer could use to send an email.

The obvious answer here is mail(), but I’m also looking for a list of functions someone might use to manually open a connection to an MTA, or spawn a process on the local machine which might in turn send an email using sendmail, postfix, etc.

The context here is I want to scan a large, unknown codebase for code that’s sending out email (because we already located a call to mail(), and that’s not doing it)

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1 Answer

  1. Editorial Team

    And as well as the backtick, also check for popen() and system execution functions…
    https://www.php.net/manual/en/ref.exec.php

    exec
passthru
proc_close
proc_get_status
proc_open
proc_terminate
shell_exec
system
`

    IMAP may be another depending on how PHP was configured… http://www.php.net/manual/en/ref.imap.php

       fsockopen is most likely the other one
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