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

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 <reference id="ref.strings">
  <title>String Functions</title>
  <titleabbrev>Strings</titleabbrev>

  <partintro>
   <section id="strings.intro">
    &reftitle.intro;
    <para>
     These functions all manipulate strings in various ways. Some more
     specialized sections can be found in the regular expression and
     <link linkend="ref.url">URL handling</link> sections.
    </para>
    <para>
     For information on how strings behave, especially with regard to
     usage of single quotes, double quotes, and escape sequences, see
     the <link linkend="language.types.string">Strings</link> entry in
     the <link linkend="language.types">Types</link> section of the
     manual.
    </para>
   </section>

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

   <section id="strings.installation">
    &reftitle.install;
    &no.install;
   </section>
   
   &reference.strings.constants;
   
   <section id="strings.seealso">
    &reftitle.seealso;
    <para>
     For even more powerful string handling and manipulating functions
     take a look at the <link linkend="ref.regex">POSIX regular
     expression functions</link> and the <link linkend="ref.pcre">Perl
     compatible regular expression functions</link>.
    </para>
   </section>
  </partintro>

&reference.strings.functions;

 </reference>
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