PHP Function References

PHP has a vast collection of built-in functions that can be used to perform various tasks. Here are some commonly used PHP function references:

1. echo() – Used to output one or more strings or variables to the screen.
2. print() – Outputs a string.
3. strlen() – Returns the length of a string.
4. strtoupper() – Converts a string to uppercase.
5. strtolower() – Converts a string to lowercase.
6. substr() – Returns a portion of a string.
7. explode() – Splits a string into an array.
8. implode() – Joins elements of an array into a string.
9. array() – Creates an array.
10. count() – Counts the number of elements in an array.
11. isset() – Checks if a variable is set and not null.
12. empty() – Checks if a variable is empty.
13. array_push() – Adds one or more elements to the end of an array.
14. array_pop() – Removes the last element from an array.
15. array_shift() – Removes the first element from an array.
16. array_unshift() – Adds one or more elements to the beginning of an array.
17. array_merge() – Merges two or more arrays.
18. array_search() – Searches an array for a given value and returns the corresponding key if successful.
19. sort() – Sorts an array in ascending order.
20. rsort() – Sorts an array in descending order.
21. array_reverse() – Reverses the order of the elements in an array.
22. rand() – Generates a random number.
23. time() – Returns the current Unix timestamp.
24. date() – Formats a date and/or time.
25. file_get_contents() – Reads the contents of a file into a string.
26. file_put_contents() – Writes a string to a file.
27. fopen() – Opens a file or URL.
28. fclose() – Closes an open file pointer.
29. fwrite() – Writes to an open file pointer.
30. fread() – Reads from an open file pointer.