Overview of PHP Functions
PHP offers a rich library of functions to handle a wide range of development tasks, including type conversion, string manipulation, array operations, conditional logic, file handling, math calculations, and date and time management.
Type Conversion and Formatting
- intval(): Converts a variable to an integer.
- floatval(): Converts a variable to a float.
- strval(): Converts a variable to a string.
- ucfirst(): Capitalizes the first character of a string.
- ucwords(): Capitalizes the first character of each word in a string.
String Operations
- strlen(): Gets the length of a string.
- strpos(): Finds the position of a substring within a string.
- substr(): Extracts a substring from a string.
- explode(): Splits a string into an array.
- implode(): Joins an array into a string.
Array Operations
- count(): Returns the number of elements in an array.
- in_array(): Checks if an element exists in an array.
- array_merge(): Merges multiple arrays.
- array_keys(): Gets all keys from an array.
- array_values(): Gets all values from an array.
Conditional Statements
- if(): Executes code based on a condition.
- elseif(): Executes code if the first condition is false.
- else(): Executes code if all conditions are false.
- switch(): Executes different code blocks based on a specific value.
File Handling
- fopen(): Opens a file.
- fwrite(): Writes to a file.
- fread(): Reads file contents.
- fclose(): Closes a file.
Math Functions
- abs(): Returns the absolute value of a number.
- sin(): Calculates the sine of a number.
- cos(): Calculates the cosine of a number.
- tan(): Calculates the tangent of a number.
- pow(): Calculates the power of a number.
Date and Time Functions
- date(): Gets the current date and time.
- strtotime(): Converts a time string into a timestamp.
- gmdate(): Gets the Greenwich Mean Time date and time.
- mktime(): Converts a date and time into a timestamp.
Conclusion
The above content covers the most commonly used PHP function categories and examples, helping developers quickly grasp essential functions for daily development tasks.
