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

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 <reference id="ref.exec">
  <title>Program Execution functions</title>
  <titleabbrev>Program Execution</titleabbrev>

  <partintro>
   <section id="exec.intro">
   &reftitle.intro;
   <simpara>
    Those functions provides means to executes commands on the
    system itself, and means secure such commands.
   </simpara>
   </section>

   <section id="exec.requirements">
    &reftitle.required;
    &no.requirement;
   </section>

   <section id="exec.installation">
    &reftitle.install;
    &no.install;
   </section>

   <section id="exec.configuration">
    &reftitle.runtime;
    &no.config;
   </section>

   <section id="exec.resources">
    &reftitle.resources;
    &no.resource;
   </section>

   <section id="exec.constants">
    &reftitle.constants;
    &no.constants;
   </section>

   <section 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 <link linkend="features.safe-mode">Safe Mode</link> you
     must consider the <link linkend="ini.safe-mode-exec-dir">
     safe_mode_exec_dir</link> directive.
    </para>
   </section>

  </partintro>

&reference.exec.functions;

 </reference>
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