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<HTML
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>Comparison Operators</TITLE
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><DIV
CLASS="sect1"
><H1
CLASS="sect1"
><A
NAME="language.operators.comparison"
>Comparison Operators</A
></H1
><P
>&#13;    Comparison operators, as their name implies, allow you to compare
    two values.
   </P
><DIV
CLASS="table"
><A
NAME="AEN3066"
></A
><P
><B
>Table 10-3. Comparison Operators</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><THEAD
><TR
><TH
ALIGN="LEFT"
VALIGN="MIDDLE"
>Example</TH
><TH
ALIGN="LEFT"
VALIGN="MIDDLE"
>Name</TH
><TH
ALIGN="LEFT"
VALIGN="MIDDLE"
>Result</TH
></TR
></THEAD
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>$a == $b</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Equal</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>True if $a is equal to $b.</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>$a === $b</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Identical</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>&#13;	True if $a is equal to $b, and they are of the same
	type. (PHP 4 only)
       </TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>$a != $b</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Not equal</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>True if $a is not equal to $b.</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>$a !== $b</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Not identical</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>&#13;	True if $a is not equal to $b, or they are not of the same
	type. (PHP 4 only)
       </TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>$a &#60; $b</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Less than</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>True if $a is strictly less than $b.</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>$a &#62; $b</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Greater than</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>True if $a is strictly greater than $b.</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>$a &#60;= $b</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Less than or equal to </TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>True if $a is less than or equal to $b.</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>$a &#62;= $b</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Greater than or equal to </TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>True if $a is greater than or equal to $b.</TD
></TR
></TBODY
></TABLE
></DIV
><P
>&#13;    Another conditional operator is the "?:" (or trinary) operator,
    which operates as in C and many other languages.
    <DIV
CLASS="informalexample"
><A
NAME="AEN3108"
></A
><P
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="programlisting"
>&#13;(expr1) ? (expr2) : (expr3);
     </PRE
></TD
></TR
></TABLE
><P
></P
></DIV
> 
    This expression evaluates to <TT
CLASS="replaceable"
><I
>expr2</I
></TT
> if
    <TT
CLASS="replaceable"
><I
>expr1</I
></TT
> evaluates to true, and
    <TT
CLASS="replaceable"
><I
>expr3</I
></TT
> if
    <TT
CLASS="replaceable"
><I
>expr1</I
></TT
> evaluates to false.
   </P
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