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HTML Introduction HTML Tags HTML Elements HTML Attributes HTML Heading HTML Paragraph HTML Formatting HTML Quotations HTML Comments HTML Styles HTML Color HTML CSS HTML Images HTML Favicon HTML Links HTML DIV HTML Tables HTML Table Size HTML Table Head Table Padding & Spacing Table colspan rowspsn HTML Table Styling HTML Colgroup HTML List HTML Block & Inline HTML Classes HTML Id HTML Iframes HTML Head HTML Layout HTML Semantic Elements HTML Style Guide HTML Forms HTML Form Attribute HTML Form Element HTML input type HTML Computer code HTML Entity HTML Symbol HTML Emojis HTML Charset HTML Input Form Attribute HTML URL Encoding
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CSS
CSS Introduction CSS Syntax CSS Selector How To Add CSS CSS Comments CSS Colors CSS Background color CSS background-image CSS Borders CSS Margins CSS Height, Width and Max-width CSS Box Model CSS Outline CSS Text CSS Fonts CSS Icon CSS Links CSS Tables CSS Display CSS Maximum Width CSS Position z-index Property
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JQuery
What is jQuery? Benefits of using jQuery Include jQuery Selectors. Methods. The $ symbol and shorthand. Selecting elements Getting and setting content Adding and removing elements Modifying CSS and classes Binding and Unbinding events Common events: click, hover, focus, blur, etc Event delegation Using .on() for dynamic content Showing and hiding elements Fading elements in and out Sliding elements up and down .animate() Understanding AJAX .ajax() .load(), .get(), .post() Handling responses and errors. Parent Chlid Siblings Filtering Elements Using find Selecting form elements Getting form values Setting form values Form validation Handling form submissions jQuery plugins Sliders plugins $.each() $.trim() $.extend() Data attributes Debugging jQuery code
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Bootstrap 4
What is Bootstrap Benefits of using Setting up Container Row and Column Grid Classes Breakpoints Offsetting Columns Column Ordering Basic Typography Text Alignment Text colors Backgrounds Display Font Size Utilities Buttons Navs and Navbar Forms Cards Alerts Badges Progress Bars Margin Padding Sizing Flexbox Dropdowns Modals Tooltips Popovers Collapse Carousel Images Tables Jumbotron Media Object
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PHP
PHP Introduction PHP Installation PHP Syntax PHP Comments PHP Variable PHP Echo PHP Data Types PHP Strings PHP Constant PHP Maths PHP Number PHP Operators PHP if else & if else if PHP Switch PHP Loops PHP Functions PHP Array PHP OOps PHP Class & Object PHP Constructor PHP Destructor PHP Access Modfiers PHP Inheritance PHP Final Keyword PHP Class Constant PHP Abstract Class PHP Superglobals PHP Regular Expression PHP Interfaces PHP Static Method PHP Static Properties PHP Namespace PHP Iterable PHP Form Introduction PHP Form Validation PHP Complete Form PHP Date and Time PHP Include Files PHP - Files & I/O File Upload PHP Cookies PHP SESSION PHP Filters PHP Callback Functions PHP JSON PHP AND Exceptions PHP Connect database
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MY SQL
SQL Introduction Syntax Select statement Select Distinct WHERE Clause Order By SQL AND Operator SQL OR Operator SQL NOT Operator SQL LIKE SQL IN SQL BETWEEN SQL INSERT INTO SQL NULL Values SQL UPDATE SQL DELETE SQL TOP, LIMIT, FETCH FIRST or ROWNUM Clause SQL MIN() and MAX() Functions SQL COUNT() Function SQL SUM() SQL AVG() SQL Aliases SQL JOIN SQL INNER JOIN SQL LEFT JOIN SQL RIGHT JOIN SQL FULL OUTER JOIN SQL Self Join SQL UNION SQL GROUP BY SQL HAVING SQL EXISTS SQL ANY and ALL SQL SELECT INTO SQL INSERT INTO SELECT SQL CASE SQL NULL Functions SQL Stored Procedures SQL Comments SQL Operators SQL CREATE DATABASE SQL DROP DATABASE SQL BACKUP DATABASE SQL CREATE TABLE SQL DROP TABLE SQL ALTER TABLE SQL Constraints SQL NOT NULL SQL UNIQUE Constraint SQL PRIMARY KEY SQL FOREIGN KEY SQL CHECK Constraint SQL CREATE INDEX SQL AUTO INCREMENT SQL Dates SQL Views SQL Injection SQL Hosting SQL Data Types
What are the differences between PHP 5 and PHP 7?
Here’s a table that outlines the key differences between PHP 5 and PHP 7:
Feature | PHP 5 | PHP 7 |
---|---|---|
Performance | Slower execution and memory usage. | Significantly faster with optimized memory usage (up to 2x faster). |
Type Declarations | Limited to type hinting for arrays and objects. | Supports scalar type declarations for int , float , string , and bool . |
Return Type Declarations | Not available. | Introduced return type declarations for functions and methods. |
Error Handling | Errors (e.g., fatal errors) halt execution and are not recoverable. | Introduced the Engine Exceptions system, enabling better error handling using \Throwable . |
Spaceship Operator (<=> ) |
Not available. | Introduced for combined comparison of two expressions (x <=> y ). |
Null Coalescing Operator (?? ) |
Not available. | Introduced for shorthand null checks ($x = $a ?? $b ). |
Anonymous Classes | Not supported. | Introduced support for creating anonymous classes. |
New Operators | No new operators in PHP 5. | Introduced operators like null coalescing (?? ) and spaceship (<=> ). |
Uniform Variable Syntax | Not consistent; could be confusing in complex variable references. | Improved, providing consistent behavior for variable references. |
Memory Usage | Higher memory consumption. | Reduced memory usage through optimized memory management. |
E_STRICT Error Reporting |
E_STRICT was a separate error level. |
E_STRICT errors are included in E_ALL in PHP 7. |
Deprecated Items | Certain functions (e.g., mysql_* ) were deprecated but still used. |
Fully removed deprecated functions (e.g., mysql_* functions). |
Unicode Codepoint Escape | Not available. | Added support for \u{} escape syntax for Unicode codepoints. |
Scalar Type Hints | Not available. | Allows type hints for scalar values (int , string , bool , etc.). |
Fatal Error Handling | Fatal errors halted execution without recoverability. | Fatal errors now throw EngineException , making it easier to handle. |
Consistent 64-bit Support | 64-bit support inconsistent across platforms. | Consistent 64-bit support on all platforms, including Windows. |
Integer Division | No dedicated function for integer division. | Introduced intdiv() function for integer division. |
Anonymous Function Support | Supported but no anonymous class support. | Supported with the addition of anonymous classes. |
Extensions | Some older extensions were bundled with core PHP. | Some old and rarely used extensions removed for optimization. |
Backward Compatibility | More backward compatibility for older codebases. | Some breaking changes in compatibility with older PHP 5 code. |
New Reserved Keywords | No new reserved keywords introduced. | Introduced new reserved keywords like int , float , bool , string , etc. |
Consistent Error Handling for foreach |
Some inconsistencies when modifying arrays within a loop. | Improved consistency when modifying arrays during foreach loops. |
PHPNG (PHP Next-Gen Engine) | Not implemented. | Introduced a new Zend Engine (PHPNG) for improved performance. |
Summary:
- PHP 7 offers significant performance improvements, better memory management, and enhanced error handling.
- It introduces modern programming features like type declarations, return type hints, new operators, and anonymous classes.
- Deprecated features were completely removed, making PHP 7 more efficient and secure.
This makes PHP 7 a more powerful and performance-oriented language compared to PHP 5.
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