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

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<appendix xml:id="exec.constants" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 &reftitle.constants;
 &extension.constants.core;
 <para> flags for <function>escapeshellcmd</function>:
 <variablelist>
  <varlistentry>
   <term>
    <constant>ESCAPE_CMD_PAIR</constant> 
    (<type>integer</type>)
   </term>
   <listitem>
    <simpara>
      When <constant>ESCAPE_CMD_PAIR</constant> (default) is specified,
      the quotation is escaped only if it is not paired.
      (only valid for non-Win32 environment)
    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry>
   <term>
    <constant>ESCAPE_CMD_END</constant> 
    (<type>integer</type>)
   </term>
   <listitem>
    <simpara>
     When <constant>ESCAPE_CMD_END</constant> is specified,
     the quotation is escaped except for the beginning/ending of string.
      (only valid for non-Win32 environment)
    </simpara>
   </listitem>
  </varlistentry>
  <varlistentry>
   <term>
    <constant>ESCAPE_CMD_ALL</constant> 
    (<type>integer</type>)
   </term>
   <listitem>
    <simpara>
     When <constant>ESCAPE_CMD_ALL</constant> is specified,
     the quotation is always escaped.
      (only valid for non-Win32 environment)
    </simpara>
   </listitem>
  </varlistentry>
 </variablelist>
 </para>
</appendix>

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