<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Convert the first byte of a string to a value between 0 and 255</title> </head> <body><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.number-format.html">number_format</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.parse-str.html">parse_str</a></div> <div class="up"><a href="ref.strings.html">String Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div><hr /><div id="function.ord" class="refentry"> <div class="refnamediv"> <h1 class="refname">ord</h1> <p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">ord</span> — <span class="dc-title">Convert the first byte of a string to a value between 0 and 255</span></p> </div> <div class="refsect1 description" id="refsect1-function.ord-description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">int</span> <span class="methodname"><strong>ord</strong></span> ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$string</code></span> )</div> <p class="para rdfs-comment"> Interprets the binary value of the first byte of <code class="parameter">string</code> as an unsigned integer between 0 and 255. </p> <p class="para"> If the string is in a single-byte encoding, such as ASCII, ISO-8859, or Windows 1252, this is equivalent to returning the position of a character in the character set's mapping table. However, note that this function is not aware of any string encoding, and in particular will never identify a Unicode code point in a multi-byte encoding such as UTF-8 or UTF-16. </p> <p class="para"> This function complements <span class="function"><a href="function.chr.html" class="function">chr()</a></span>. </p> </div> <div class="refsect1 parameters" id="refsect1-function.ord-parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <code class="parameter">string</code></dt> <dd> <p class="para"> A character. </p> </dd> </dl> </p> </div> <div class="refsect1 returnvalues" id="refsect1-function.ord-returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> An integer between 0 and 255. </p> </div> <div class="refsect1 examples" id="refsect1-function.ord-examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example" id="example-6058"> <p><strong>Example #1 <span class="function"><strong>ord()</strong></span> example</strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br />$str </span><span style="color: #007700">= </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />if (</span><span style="color: #0000BB">ord</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">) == </span><span style="color: #0000BB">10</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">"The first character of \$str is a line feed.\n"</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> </div> </p> <p class="para"> <div class="example" id="example-6059"> <p><strong>Example #2 Examining the individual bytes of a UTF-8 string</strong></p> <div class="example-contents"> <div class="phpcode"><code><span style="color: #000000"> <span style="color: #0000BB"><?php<br /></span><span style="color: #007700">declare(</span><span style="color: #0000BB">encoding</span><span style="color: #007700">=</span><span style="color: #DD0000">'UTF-8'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$str </span><span style="color: #007700">= </span><span style="color: #DD0000">"🐘"</span><span style="color: #007700">;<br />for ( </span><span style="color: #0000BB">$pos</span><span style="color: #007700">=</span><span style="color: #0000BB">0</span><span style="color: #007700">; </span><span style="color: #0000BB">$pos </span><span style="color: #007700">< </span><span style="color: #0000BB">strlen</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">); </span><span style="color: #0000BB">$pos </span><span style="color: #007700">++ ) {<br /> </span><span style="color: #0000BB">$byte </span><span style="color: #007700">= </span><span style="color: #0000BB">substr</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">, </span><span style="color: #0000BB">$pos</span><span style="color: #007700">);<br /> echo </span><span style="color: #DD0000">'Byte ' </span><span style="color: #007700">. </span><span style="color: #0000BB">$pos </span><span style="color: #007700">. </span><span style="color: #DD0000">' of $str has value ' </span><span style="color: #007700">. </span><span style="color: #0000BB">ord</span><span style="color: #007700">(</span><span style="color: #0000BB">$byte</span><span style="color: #007700">) . </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?></span> </span> </code></div> </div> <div class="example-contents"><p>The above example will output:</p></div> <div class="example-contents screen"><br /> Byte 0 of $str has value 240<br /> Byte 1 of $str has value 159<br /> Byte 2 of $str has value 144<br /> Byte 3 of $str has value 152<br /> </div> </div> </p> </div> <div class="refsect1 seealso" id="refsect1-function.ord-seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><span class="function"><a href="function.chr.html" class="function" rel="rdfs-seeAlso">chr()</a> - Generate a single-byte string from a number</span></li> <li class="member">An <a href="http://www.asciitable.com" class="link external">» ASCII-table</a></li> </ul> </p> </div> </div><hr /><div class="manualnavbar" style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.number-format.html">number_format</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.parse-str.html">parse_str</a></div> <div class="up"><a href="ref.strings.html">String Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div> </div></body></html>