Posts (page 156)
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7 min readThe preg_match function is a powerful tool in PHP that allows you to perform regular expression pattern matching. It searches a given string for a specific pattern and returns true if a match is found, or false otherwise.To use preg_match, you need to provide two main arguments: the pattern and the subject string. The pattern is a regular expression that describes the pattern you are searching for, and the subject string is the text you want to search within.
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7 min readIn JavaScript, you can clear multiple user inputs by accessing each input element individually and setting their values to an empty string.To achieve this, you can make use of the getElementById() method or other query selectors to obtain references to the input elements. Then, you can use the value property to set their values to an empty string.
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5 min readTo save a JSON array in MySQL using PHP, you can follow these steps:Establish a connection to the MySQL database using PHP's mysqli or PDO extension.Convert the JSON array into a PHP array using json_decode(). This will allow easy manipulation and database insertion.Prepare an SQL insert statement with placeholders for the JSON array data.Bind the JSON array data to the corresponding placeholders in the prepared statement.
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7 min readTo remove specific elements from an array in JavaScript, you can use various methods. Here are a few common approaches:Using the splice() method: This method changes the content of an array by removing or replacing existing elements. You can provide the index at which to start removing elements and the number of elements to remove. For example, to remove a specific element at index 2, you can use: array.splice(2, 1). This removes one element at index 2 from the array.
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6 min readTo import JavaScript from an external file, you can follow these steps:Create a separate JavaScript file with a .js extension. For example, you can create a file named script.js. In the main HTML file where you want to use the JavaScript code, include a script tag inside the head or body section. This script tag is used to import the external JavaScript file. The source attribute of the script tag should point to the location and name of the JavaScript file.
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5 min readTo fill an array with a for loop in JavaScript, you can follow these steps:Create an empty array that you want to fill.Determine the length of the array you want to create and assign it to a variable.Use a for loop to iterate over each index of the array.Inside the loop, use the index to assign values to each element of the array.The values can be assigned using any logic or algorithm you desire.
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5 min readTo add a line under a header in HTML, you can use the <hr> tag. <hr> stands for horizontal rule and represents a thematic break or separation between content. Here's how you can add a line under a header in HTML: <h1>This is a header</h1> <hr> In this example, the <h1> element represents the header text, and the <hr> tag adds a horizontal line directly below it. The line will stretch across the full width of its container.
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4 min readIn JavaScript, you can convert a Unicode code point into its corresponding character using the String.fromCharCode() method. Here's an example: var unicodeValue = 9731; var character = String.fromCharCode(unicodeValue); console.log(character); // Output: ☃ In the example above, the Unicode value 9731 is passed as an argument to the String.fromCharCode() method, which returns the character corresponding to that Unicode value.
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6 min readTo add a media query in HTML, you need to use CSS (Cascading Style Sheets). Here's how to do it:Define a CSS rule using the @media rule. The @media rule defines different style rules for different media types or screen resolutions. Example: @media screen and (max-width: 600px) { /* CSS rules for screens narrower than 600px */ } Inside the @media rule, specify the conditions for which the CSS rules should apply. This is done using media features like screen width, height, orientation, etc.
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4 min readTo keep headings centered in HTML, you can use CSS to style the headings with appropriate properties. Here's an example of how to center headings using CSS: <.
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5 min readTo override a class in JavaScript, you can make use of inheritance and prototypes. Here's how you can do it:Define the original class: Start by creating the original class using the class keyword or a constructor function. Create the overriding class: Declare a new class that will override the original class or create a constructor function that will serve as the overridden class.
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4 min readTo display double quotes in HTML, you can use the entity reference code for double quotes, which is &quot;. This code will be rendered as a double quote symbol on the webpage.For example: <p>This is an example with double quotes: &quot;Hello world!&quot;</p> In the above code, the text within the paragraph will be displayed as: "This is an example with double quotes: "Hello world.