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>Comparison Operators</H1
><P
> Comparison operators, as their name implies, allow you to compare
two values.
</P
><DIV
CLASS="table"
><A
NAME="AEN4558"
></A
><P
><B
>Table 11-4. 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"
><TT
CLASS="constant"
><B
>TRUE</B
></TT
> 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"
> <TT
CLASS="constant"
><B
>TRUE</B
></TT
> 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"
><TT
CLASS="constant"
><B
>TRUE</B
></TT
> if $a is not equal to $b.</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>$a <> $b</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Not equal</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
><TT
CLASS="constant"
><B
>TRUE</B
></TT
> 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"
> <TT
CLASS="constant"
><B
>TRUE</B
></TT
> 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 < $b</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Less than</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
><TT
CLASS="constant"
><B
>TRUE</B
></TT
> if $a is strictly less than $b.</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>$a > $b</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Greater than</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
><TT
CLASS="constant"
><B
>TRUE</B
></TT
> if $a is strictly greater than $b.</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>$a <= $b</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Less than or equal to </TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
><TT
CLASS="constant"
><B
>TRUE</B
></TT
> if $a is less than or equal to $b.</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>$a >= $b</TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
>Greater than or equal to </TD
><TD
ALIGN="LEFT"
VALIGN="MIDDLE"
><TT
CLASS="constant"
><B
>TRUE</B
></TT
> if $a is greater than or equal to $b.</TD
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></DIV
><P
> Another conditional operator is the "?:" (or ternary) operator,
which operates as in C and many other languages.
<DIV
CLASS="informalexample"
><A
NAME="AEN4613"
></A
><P
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="php"
>(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 <TT
CLASS="constant"
><B
>TRUE</B
></TT
>, and
<TT
CLASS="replaceable"
><I
>expr3</I
></TT
> if
<TT
CLASS="replaceable"
><I
>expr1</I
></TT
> evaluates to <TT
CLASS="constant"
><B
>FALSE</B
></TT
>.
</P
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