PHP and MySQL syntax: Difference between revisions

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PHP and MySQL syntax (edit)

Revision as of 17:36, 5 April 2019

2,063 bytes removed ,  5 April 2019
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→‎Number of characters
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=== Number of characters ===
=== Number of characters ===


 
[[Number of characters]]
<table border="1" class="wikitable sortable">
<tr>
<th>Example of string</th>
<th>Number of characters</th>
<th>Number of bytes</th>
</tr>
<tr>
<td>fox</td>
<td>3</td>
<td>3</td>
</tr>
<tr>
<td>The quick brown fox jumps over the lazy dog</td>
<td>43</td>
<td>43</td>
</tr>
<tr>
<td>狐</td>
<td>1</td>
<td>2</td>
</tr>
<tr>
<td>敏捷的棕毛狐狸從懶狗身上躍過</td>
<td>14</td>
<td>28</td>
</tr>
</table>
 
 
* PHP: [http://php.net/mb_strlen PHP mb_strlen function]
<pre>
// number of characters
echo mb_strlen("狐", 'UTF-8') . PHP_EOL; // return 1
echo mb_strlen("《王大文 Dawen》", 'UTF-8') . PHP_EOL; // return 11
 
// number of bytes
echo strlen("狐") . PHP_EOL; // return 3
echo strlen("《王大文 Dawen》") . PHP_EOL; // return 21
</pre>
* MySQL: [http://www.w3resource.com/mysql/string-functions/mysql-char_length-function.php MySQL CHAR_LENGTH() function]
<PRE>
// number of characters
SELECT CHAR_LENGTH("狐"); /* return 1 */
SELECT CHAR_LENGTH("《王大文 Dawen》"); /* return 11 */
 
// number of bytes
SELECT LENGTH("狐"); /* return 3 */
SELECT LENGTH("《王大文 Dawen》"); /* return 21 */
</PRE>
* [https://dev.mysql.com/doc/refman/8.0/en/char.html MySQL :: MySQL 8.0 Reference Manual :: 11.4.1 The CHAR and VARCHAR Types] e.g. {{kbd | key=<nowiki>VARCHAR(5)</nowiki>}} or {{kbd | key=<nowiki>CHAR(5)</nowiki>}} means can hold up to 5 characters.
* Excel: [https://support.office.com/en-us/article/len-lenb-functions-29236f94-cedc-429d-affd-b5e33d2c67cb LEN, LENB functions] / [https://support.office.com/zh-tw/article/LEN%E3%80%81LENB-%E5%87%BD%E6%95%B8-29236f94-cedc-429d-affd-b5e33d2c67cb LEN、LENB 函數]
<pre>
// number of characters
=LEN("狐") // return 1
=LEN("《王大文 Dawen》") // return 11
 
// number of bytes
=LENB("狐") // return 2
=LENB("《王大文 Dawen》") // return 16
</pre>
 
* [http://string-functions.com/length.aspx Calculate String Length Online]
* [https://stackoverflow.com/questions/5290182/how-many-bytes-does-one-unicode-character-take string - How many bytes does one Unicode character take? - Stack Overflow]


=== text match ===
=== text match ===
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