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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Arithmetic Operators</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="language.operators.html">Operators</a></div> <div class="next" style="text-align: right; float: right;"><a href="language.operators.assignment.html">Assignment Operators</a></div> <div class="up"><a href="language.operators.html">Operators</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="language.operators.arithmetic" class="sect1"> <h2 class="title">Arithmetic Operators</h2> <p class="simpara"> Remember basic arithmetic from school? These work just like those. </p> <table border="5"> <caption><b>Arithmetic Operators</b></caption> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">Example</th> <th colspan="1">Name</th> <th colspan="1">Result</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">-$a</td> <td colspan="1" rowspan="1" align="left">Negation</td> <td colspan="1" rowspan="1" align="left">Opposite of $a.</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">$a + $b</td> <td colspan="1" rowspan="1" align="left">Addition</td> <td colspan="1" rowspan="1" align="left">Sum of $a and $b.</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">$a - $b</td> <td colspan="1" rowspan="1" align="left">Subtraction</td> <td colspan="1" rowspan="1" align="left">Difference of $a and $b.</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">$a * $b</td> <td colspan="1" rowspan="1" align="left">Multiplication</td> <td colspan="1" rowspan="1" align="left">Product of $a and $b.</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">$a / $b</td> <td colspan="1" rowspan="1" align="left">Division</td> <td colspan="1" rowspan="1" align="left">Quotient of $a and $b.</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">$a % $b</td> <td colspan="1" rowspan="1" align="left">Modulus</td> <td colspan="1" rowspan="1" align="left">Remainder of $a divided by $b.</td> </tr> </tbody> </colgroup> </table> <p class="simpara"> The division operator ("/") returns a float value unless the two operands are integers (or strings that get converted to integers) and the numbers are evenly divisible, in which case an integer value will be returned. </p> <p class="simpara"> Operands of modulus are converted to integers (by stripping the decimal part) before processing. </p> <blockquote><p><b class="note">Note</b>: <span class="simpara"> Remainder <i>$a % $b</i> is negative for negative <i>$a</i>. </span> </p></blockquote> <p class="simpara"> See also the manual page on <a href="ref.math.html" class="link">Math functions</a>. </p> </div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="language.operators.html">Operators</a></div> <div class="next" style="text-align: right; float: right;"><a href="language.operators.assignment.html">Assignment Operators</a></div> <div class="up"><a href="language.operators.html">Operators</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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