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  • how to check if a php array is empty
    how to check if a php array is empty
    To determine whether the PHP array is empty, you need to pay attention to the variable type and usage scenario. 1. Use empty() to directly determine whether the array has elements, but do not check whether the variable is an array, which is suitable for cases where it is known to be an array; 2. It is more intuitive to judge whether the array length is 0 through count(), but it is necessary to avoid warnings with is_array(); 3. It is recommended to use is_array() first to ensure that the variable is an array and then combine empty() to comprehensively judge to improve the code robustness; 4. Avoid using $array==[] or if(!$array) and other methods that are prone to cause misjudgment.
    PHP Tutorial . Backend Development 250 2025-07-03 10:18:12
  • what is the syntax for a nested php array
    what is the syntax for a nested php array
    The method to define nested PHP arrays is to put the array into other arrays, for example: $nestedArray=['first-level-key'=>['second-level-key'=>'value']]; or use a numeric index: $nestedArray=[['key'=>'value']]; Accessing elements of nested arrays can be achieved through chain call keys or indexes, such as echo$nestedArray['first-level-key']['second-level-key']; or echo$nestedArray0; it should be confirmed before accessing deep elements.
    PHP Tutorial . Backend Development 523 2025-07-03 10:17:30
  • php preg_split by multiple delimiters
    php preg_split by multiple delimiters
    The method of splitting strings by multiple delimiters in PHP is achieved through regular expressions. 1. The basic syntax is preg_split('/pattern/',$subject), for example, it can be written as $parts=preg_split('/[,:;]/',$string); 2. In order to deal with spaces and other whitespace characters, you can add \\s* to the regular, such as $parts=preg_split('/\s[,;:]\s/',$string), which can automatically clear unnecessary spaces; 3. If you want to exclude null values ??caused by continuous separators, you can add PREG_SPLIT_N
    PHP Tutorial . Backend Development 769 2025-07-03 10:17:11
  • php regex match unicode characters
    php regex match unicode characters
    The key to handling PHP regular matching Unicode characters is to enable the /u modifier and ensure UTF-8 encoding. 1. Use the /u modifier to make the regular support Unicode, such as preg_match('/\p{L} /u',$str,$matches) to match multilingual letters; 2. Use the \p{} attribute to match specific characters such as Chinese \p{Han} or emoji \p{Emoji}; 3. Ensure that the input and output data are UTF-8 encoding, otherwise you need to use mb_convert_encoding to convert, otherwise it will fail even if /u is added.
    PHP Tutorial . Backend Development 364 2025-07-03 10:16:10
  • php preg_match_all get all matches in an array
    php preg_match_all get all matches in an array
    To get the complete matching array using preg_match_all, you need to specify parameters and process the output structure. 1. When using PREG_PATTERN_ORDER, the complete match is in $matches[0]; 2. When using PREG_SET_ORDER, each match is a subarray, and the complete match is in $match[0]; 3. If there is no subgroup, you can avoid using brackets or using non-capturing groups (?:...). You can directly extract $matches[0] to obtain a complete match array.
    PHP Tutorial . Backend Development 932 2025-07-03 10:15:31
  • what is the 'u' modifier in php regex
    what is the 'u' modifier in php regex
    TheumodifierinPHPensuresproperhandlingofUTF-8encodedstringsinregularexpressions.1.IttellsthePCREenginethatboththepatternandinputstringareUTF-8encoded.2.Withoutu,matchingUnicodecharactersmayfailorcauseerrorslike"MalformedUTF-8characters".3.W
    PHP Tutorial . Backend Development 470 2025-07-03 10:15:10
  • how to find the intersection of a php array
    how to find the intersection of a php array
    To find the intersection of PHP arrays, use the built-in functions array_intersect(), array_intersect_key(), and array_intersect_assoc(). 1. array_intersect() compares the value to find the intersection, retaining the key of the first array; 2. array_intersect_key() only finds intersection according to the key name, ignores the value; 3. array_intersect_assoc() compares the keys and values ??at the same time, and matches exactly; 4. Notes include: suitable for strings and complex types, indexes can be continuously processed by array_values(), direct argument transmission of most arrays, and strings
    PHP Tutorial . Backend Development 650 2025-07-03 10:14:10
  • codeigniter vs laravel php framework
    codeigniter vs laravel php framework
    Laravel is suitable for medium and large projects, with comprehensive functions and rich ecology, and is suitable for long-term maintenance; CodeIgniter is suitable for small projects, with light weight and flexible, and has a low learning threshold. 1. CodeIgniter is easy to get started, suitable for beginners and short-cycle projects; Laravel has many functions but a steep learning curve, suitable for complex systems. 2. CodeIgniter has better performance, and Laravel can improve performance through caching, which is suitable for advanced functional needs. 3. Laravel is active in the community, with many expansion packages, and problem solving is faster; CodeIgniter is suitable for independent development. 4. Laravel built-in security mechanism is perfect, has good maintenance, and has clear version updates; CodeIgniter requires more manual protection
    PHP Tutorial . Backend Development 301 2025-07-03 10:12:12
  • php regex check if string contains a word
    php regex check if string contains a word
    To determine whether a string contains a complete word, using the preg_match() function with regular expressions is an effective method. 1. Use \b to represent word boundaries to ensure that the matching of the complete word rather than a substring. For example, /\bcat\b/ can avoid matching to category or scat; 2. Add the i flag to implement ignoring case searches, such as /\bapple\b/i can match Apple, APPLE and other different formats; 3. Use | and brackets to realize the "or" relationship search of multiple words, such as /\b(apple|banana|orange)\b/ can be used for keyword filtering or highlighting; 4. Pay attention to common problems: do not miss \b, deal with Chinese spaces and escape special characters, p can be used.
    PHP Tutorial . Backend Development 400 2025-07-03 10:07:11
  • Debugging common HTML validation errors.
    Debugging common HTML validation errors.
    When encountering HTML verification errors, you must first clarify the problem and correct it according to the specifications. 1. When the required attributes are missing, the src and alt and a href of img should be completed; 2. When the tag nesting is incorrect, the structure should be clarified and the tags should be closed correctly to avoid confusion in nesting block-level elements; 3. When using invalid or discarded tags, you should refer to the MDN document to replace it with modern writing methods, such as replacing center and font with CSS; 4. When character encoding problems, add metacharset="UTF-8" and ensure that the file is saved in UTF-8 format to solve it.
    HTML Tutorial . Web Front-end 257 2025-07-03 02:41:01
  • Creating interactive details and summary elements with HTML `` and ``.
    Creating interactive details and summary elements with HTML `` and ``.
    HTML and tags can be folded and expanded without JavaScript, which is suitable for scenarios such as FAQ and hidden information. 1. In the basic structure, the package content is developed as a title touch; 2. You can customize the style through CSS, such as fonts, backgrounds, and remove the default icons; 3. It is often used in FAQ pages, configuration panels, and document descriptions; 4. Use the open attribute to control the default expansion status.
    HTML Tutorial . Web Front-end 169 2025-07-03 02:39:42
  • How to create button elements in HTML forms.
    How to create button elements in HTML forms.
    Buttons are key interactive elements in HTML forms. There are two main ways to create: 1. Use tags to create custom buttons that support nested content, and the type attribute can be set to submit, reset or button; 2. Use tags to create basic buttons that only display text, suitable for simple scenarios. It is also recommended to combine CSS to set padding, font-size, border-radius and other styles to improve clickability and appearance, and enhance the interactive experience through:hover and:active status. The submission button can also use the disabled attribute to prevent repeated submissions.
    HTML Tutorial . Web Front-end 703 2025-07-03 02:39:22
  • Best way to loop large php array?
    Best way to loop large php array?
    Use foreach loops to process large PHP arrays most efficiently, avoiding reoperations within the loop; use generators to read them line by line on super-large data sets; free memory in time and optimize array structure. 1. Priority is given to foreach, which is concise and optimized, and do not use references unless necessary; 2. Avoid high-frequency database operations or complex calculations in the loop; 3. Use generator streaming to process extremely large data; 4. Use unset to free memory in time; 5. Avoid repeated calls to count() to cache in advance; 6. Select the traversal method according to the array structure, if only keys or values ??are needed, use array_keys or array_values ??but pay attention to memory overhead.
    PHP Tutorial . Backend Development 277 2025-07-03 02:38:40
  • Creating interactive elements using HTML input types beyond text.
    Creating interactive elements using HTML input types beyond text.
    Input boxes are not just for typing, HTML provides a variety of input types to enhance the interactive experience. 1.type="email" can automatically verify the mailbox format; 2.type="number" limits input numbers and sets the range; 3.type="range" is suitable for adjusting continuous values ??such as volume; 4.type="date"/"time" provides a date and time selector; 5.type="color" calls out a color selector. These types reduce the burden of JavaScript verification, and also
    HTML Tutorial . Web Front-end 218 2025-07-03 02:37:21

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