php-doc-en/reference/exec/reference.xml

<?xml version="1.0" encoding="utf-8"?>
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 <reference xml:id="ref.exec" xmlns="http://docbook.org/ns/docbook">
  <title>Program execution &Functions;</title>

  <partintro>

   <section xml:id="exec.notes">
    &reftitle.notes;
    <warning>
     <para>
      Open files with lock (especially open sessions) should be closed before
      executing a program in the background.
     </para>
    </warning>
   </section>

   <section xml:id="exec.seealso">
   &reftitle.seealso;
    <para>
     These functions are also closely related to the 
     <link linkend="language.operators.execution">backtick operator</link>.
     Also, while in &safemode; you
     must consider the <link linkend="ini.safe-mode-exec-dir">
     safe_mode_exec_dir</link> directive.
    </para>
   </section>

  </partintro>

&reference.exec.entities.functions;

 </reference>
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