Fix issue #4242 (#5912)

Author: peter279k

reference/gmp/functions/gmp-init.xml

@@ -27,6 +27,7 @@
      <simpara>
       An integer or a string. The string representation can be decimal,
       hexadecimal, octal, or binary.
+      Any whitespace in the input string is ignored.
      </simpara>
     </listitem>
    </varlistentry>
@@ -105,6 +106,9 @@
 <?php
 $a = gmp_init(123456);
 $b = gmp_init("0xFFFFDEBACDFEDF7200");
+$c = gmp_init("0xFFFFD EBACDFEDF7200");
+$d = gmp_init("FFFFD EBACDFEDF7200", 16);
+$e = gmp_init("123456789 00000");
 ?>
 ]]>
     </programlisting>