Definition and syntax introduction of PHP function trim()_PHP tutorial

Everyone is writingDefinition and usage

The PHP function trim() removes whitespace characters and other predefined characters from both ends of a string.

Syntax

trim(str,charlist) Parameter 1 str is the string to be operated on, parameter 2 charlist is optional and specifies the special symbols to be removed.

If the second parameter is not given a value, the following characters will be removed by default:

<ol class="dp-xml">
<li class="alt"><span><span>" " (ASCII 32 (0x20)), an ordinary space.   </span></span></li>
<li><span>"t" (ASCII 9 (0x09)), a tab.   </span></li>
<li class="alt"><span>"n" (ASCII 10 (0x0A)), a new line (line feed).   </span></li>
<li><span>"r" (ASCII 13 (0x0D)), a carriage return.   </span></li>
<li class="alt"><span>"" (ASCII 0 (0x00)), the NUL-byte.   </span></li>
<li><span>"x0B" (ASCII 11 (0x0B)), a vertical tab.  </span></li>
</ol>

If you want to remove other characters, you can set in parameters.

Example 1

<ol class="dp-xml">
<li class="alt"><span><span class="tag"></span><span class="tag-name">php</span><span> </span></span></li>
<li class="alt"><span><span>$</span><span class="attribute">str</span><span> = </span><span class="attribute-value">" 使用函数trim去掉字符串两端空白字符 "</span><span>; </span></span></li>
<li class="alt"><span><span>$</span><span class="attribute">str1</span><span> = </span><span class="attribute-value">trim</span><span>($str); </span></span></li>
<li class="alt"><span><span>echo "处理前有".strlen($str)."个字符"; echo "</span><span class="tag"><span class="tag-name">br</span><span class="tag">/></span><span>"; </span></span></span></li>
<li class="alt"><span><span>//www.phpjc.cn echo "</span><span class="tag"><span class="tag-name">br</span><span class="tag">/></span><span>"; </span></span></span></li>
<li class="alt"><span><span>echo "使用trim函数处理后有".strlen($str1)."个字符"; </span></span></li>
<li class="alt"><span><span class="tag">?></span><span> </span></span></li>
</ol>

Output:

There are 39 characters before processing using the PHP function trim() There are 34 characters after

Example 2

<ol class="dp-xml">
<li class="alt"><span><span class="tag"></span><span class="tag-name">php</span><span> </span></span></li>
<li class="alt"><span><span>$</span><span class="attribute">str</span><span> = </span><span class="attribute-value">"##使用函数trim去掉字符串两端特定字符####"</span><span>; </span></span></li>
<li class="alt"><span><span>$</span><span class="attribute">str1</span><span> = </span><span class="attribute-value">trim</span><span>($str,"#"); </span></span></li>
<li class="alt"><span><span>//为函数trim传入第二个参数，<br>trim将删除字符串$str两端的#字符 echo $str."</span><span class="tag"><span class="tag-name">br</span><span class="tag">></span><span>"; </span></span></span></li>
<li class="alt"><span><span>echo $str1; </span></span></li>
<li class="alt"><span><span class="tag">?></span><span> </span></span></li>
</ol>

Output:

##Use PHP function trim() Remove specific characters at both ends of the string #### Use the trim function to remove specific characters at both ends of the string

http://www.bkjia.com/PHPjc/446304.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/446304.htmlTechArticleEveryone is writing the definition and usage of PHP function trim() to remove whitespace characters and other predefined characters from both ends of a string character. Syntax trim(str,charlist) Parameters 1 str is the string to be operated on, parameters...