vrana Fri Aug 6 15:13:20 2004 EDT
Modified files:
/phpdoc/en/language operators.xml
Log:
Comparison of numerical strings (bug #23110)
http://cvs.php.net/diff.php/phpdoc/en/language/operators.xml?r1=1.77&r2=1.78&ty=u
Index: phpdoc/en/language/operators.xml
diff -u phpdoc/en/language/operators.xml:1.77 phpdoc/en/language/operators.xml:1.78
--- phpdoc/en/language/operators.xml:1.77 Mon Aug 2 06:54:00 2004
+++ phpdoc/en/language/operators.xml Fri Aug 6 15:13:20 2004
@@ -1,5 +1,5 @@
<?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.77 $ -->
+<!-- $Revision: 1.78 $ -->
<chapter id="language.operators">
<title>Operators</title>
<simpara>
@@ -461,6 +461,32 @@
</tbody>
</tgroup>
</table>
+ <para>
+ If you compare integer with the string, the string is
+ <link linkend="language.types.string.conversion">converted to number</link>.
+ If you compare two numerical strings, they are compared as integers. These
+ rules are valid also for the
+ <link linkend="control-structures.switch">switch</link> statement.
+ <informalexample>
+ <programlisting role="php">
+<![CDATA[
+<?php
+var_dump(0 == "a"); // 0 == 0 -> true
+var_dump("1" == "01"); // 1 == 1 -> true
+
+switch ("a") {
+case 0:
+ echo "0";
+ break;
+case "a": // never reached because "a" is already matched with 0
+ echo "a";
+ break;
+}
+?>
+]]>
+ </programlisting>
+ </informalexample>
+ </para>
<para>
Another conditional operator is the "?:" (or ternary) operator.
<informalexample>
