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- How to create a text area in an HTML form
- Usethetextareaelementformulti-linetextinputinHTMLforms.Itsupportsattributeslikerowsandcolsforsize,placeholderforhints,anddefaulttextwithintags,idealforcommentsormessages.
- HTML Tutorial . Web Front-end 868 2025-09-21 05:25:16
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- How to use the details and summary tags in HTML
- ThedetailsandsummaryHTMLtagscreatecollapsiblesections,wheresummaryactsasaclickabletoggleforhiddencontentinsidedetails.2.Bydefault,thecontentiscollapsed;addingtheopenattributekeepsitexpandedonload.3.CSScanstyletheappearance,suchasremovingthedefaultarr
- HTML Tutorial . Web Front-end 328 2025-09-21 05:21:05
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- How to get the last inserted ID from a database in PHP?
- Use lastInsertId() of PDO or insert_id of MySQLi to get the last inserted ID. 1. After executing INSERT in PDO, call $pdo->lastInsertId(); 2. Use $mysqli->insert_id in the MySQLi object mode, and use mysqli_insert_id ($connection) in the process mode. It needs to be called immediately to avoid unreliable methods such as SELECTMAX(id).
- PHP Tutorial . Backend Development 131 2025-09-21 04:59:01
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- How to use the div tag in HTML
- ThedivtaggroupswebpagecontentandstructureslayoutwhenstyledwithCSSorJavaScript.Useittowraprelatedelementslikeheadersorfooters,assignclassesorIDsforstyling,applyCSSforvisualcontrol,andcombinewithsemantictagsforbetterstructure.Example:styledwith.contain
- HTML Tutorial . Web Front-end 948 2025-09-21 04:51:06
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- How to update a record in a database with PHP?
- ToupdateadatabaserecordinPHP,firstconnectusingPDOorMySQLi,thenusepreparedstatementstoexecuteasecureSQLUPDATEquery.Example:$pdo=newPDO("mysql:host=localhost;dbname=your_database",$username,$password);$sql="UPDATEusersSETemail=:emailWHER
- PHP Tutorial . Backend Development 298 2025-09-21 04:47:01
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- How to fetch data from a database in PHP?
- Use PHP to get data from databases commonly used MySQLi or PDO; 2. MySQLi supports process and object-oriented style, suitable for simple environments; 3. PDO supports a variety of databases, recommended for modern applications, more secure and flexible; 4. It is recommended to use PDO preprocessing statements to prevent SQL injection, ensuring input verification and cleaning.
- PHP Tutorial . Backend Development 348 2025-09-21 04:44:01
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- How to create radio buttons in html?
- Use type="radio" to create radio buttons, group them through the name attribute, improve accessibility with label, and use checked to set default options to ensure that users can only choose one.
- HTML Tutorial . Web Front-end 1013 2025-09-21 04:28:08
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- How to list all triggers in a MySQL database
- Use the INFORMATION_SCHEMA.TRIGGERS table to query all triggers in MySQL. Execute SELECT*FROMINFORMATION_SCHEMA.TRIGGERSWHERETRIGGER_SCHEMA=DATABASE() to list the triggers of the current database. When querying all databases, use SELECTTRIGGER_NAME,EVENT_OBJECT_SCHEMA,EVENT_OBJECT_TABLE,ACTION_TIMING,EVENT_MANIPULATIONFROMINFORMATION_SCHEMA to query all databases.
- Mysql Tutorial . Database 854 2025-09-21 04:25:01
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- How to use media queries for different screen sizes in CSS
- Responsive design is implemented through media query, first defining the minimum width condition for mobile priority, then gradually adapting to the tablet and desktop, combining range, direction and resolution to optimize the layout.
- CSS Tutorial . Web Front-end 634 2025-09-21 04:23:01
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- How to check if an email address is valid in PHP?
- Usefilter_var()tovalidateemailsyntaxandcheckdnsrr()toverifydomainMXrecords.Example:$email="user@example.com";if(filter_var($email,FILTER_VALIDATE_EMAIL)&&checkdnsrr(explode('@',$email)[1],'MX')){echo"Validanddeliverableemail&qu
- PHP Tutorial . Backend Development 468 2025-09-21 04:07:01
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- How to make text wrap around an image in html?
- UseCSSfloatpropertytowraptextaroundanimage:floatleftfortextontheright,floatrightfortextontheleft,addmarginforspacing,andclearfloatstopreventlayoutissues.
- HTML Tutorial . Web Front-end 551 2025-09-21 04:02:08
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- How to rotate an element with CSS transforms?
- Use transform:rotate() to achieve element rotation, support units such as deg, adjust the rotation center through transform-origin, and combine transition to achieve smooth animation effect.
- CSS Tutorial . Web Front-end 716 2025-09-21 03:58:01
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- How to call a parent constructor in PHP?
- WhenextendingaclassinPHP,callparent::__construct()toensuretheparent'sinitializationlogicruns.1.Iftheparentclassconstructorsetsupessentialproperties,skippingthiscallmayresultinincompleteobjectinitialization.2.Useparent::__construct()insidethechild’sco
- PHP Tutorial . Backend Development 335 2025-09-21 03:43:01
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- How to create a multi-select dropdown in html?
- Use the select element to add multiple attributes to create a multi-select drop-down box. The user presses the Ctrl or Shift key to select multiple options, displays multiple lines through the size attribute, and submits the selected value in conjunction with the name attribute array format.
- HTML Tutorial . Web Front-end 850 2025-09-21 03:39:06
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