What is the difference between PHP functions and methods?

What is the difference between PHP functions and methods?

1. Functions exist independently and are defined process-oriented, while methods depend on classes and are defined object-oriented;

2. Functions can be used as a The implementation of an algorithm, and the method can be regarded as the implementation of a business logic or function.

Tutorial recommendations: "PHP" "MySQL Tutorial"

Commonly used PHP functions

ucfirst() function converts the first character in a string to uppercase.

trim() function removes whitespace characters and other predefined characters from both ends of a string.

substr_replace() function replaces part of a string with another string.

substr_count() function counts the number of times a substring appears in a string.

substr_compare() function compares two strings from the specified starting length.

The substr() function returns a part of a string.

strtr() function converts specific characters in a string.

strtoupper() function converts a string to uppercase.

strtolower() function converts a string to lowercase.

strtok() function splits a string into smaller strings.

strstr() function searches for the first occurrence of a string within another string.

strspn() function returns the number of specific characters contained in a string.

strrpos() function finds the last occurrence of a string within another string.

strripos() function finds the last occurrence of a string within another string.

strrev() function reverses a string.

strrchr() function finds the last occurrence of a string in another string and returns all characters from that position to the end of the string.

strpos() function returns the position of the first occurrence of a string in another string.

strpbrk() function searches for any one of the specified characters in a string.

strncmp() function compares two strings.

strncasecmp() function compares two strings.

The strnatcmp() function uses a "natural" algorithm to compare two strings.

strnatcasecmp() function uses a "natural" algorithm to compare two strings.

strlen() function returns the length of the string.

stristr() function finds the first occurrence of a string in another string.

stripos() function returns the position of the first occurrence of a string in another string.

The stripslashes() function removes backslashes added by the addslashes() function.

stripcslashes() function removes backslashes added by the addcslashes() function.

strip_tags() function strips HTML, xml and PHP tags.

strcspn() function returns the number of characters searched in a string before any specified character is found.

strcoll() function compares two strings.

strcmp() function compares two strings.

strchr() function searches for the first occurrence of a string within another string.

strcasecmp() function compares two strings.

str_word_count() function counts the number of words in a string.

str_split() function splits a string into an array.

str_shuffle() function randomly shuffles all characters in a string.

str_rot13() function performs ROT13 encoding on a string.

str_replace() function uses a string to replace other characters in a string.

str_repeat() function repeats a string a specified number of times.

str_pad() function pads a string to the specified length.

str_ireplace() function uses a string to replace other characters in a string.

sscanf() function parses input from a string according to the specified format.

sprintf() function writes the formatted string into a variable.

soundex() function calculates the soundex key of a string.

similar_text() function counts the number of matching characters in two strings.

The sha1_file() function calculates the SHA-1 hash of a file.

The sha1() function calculates the SHA-1 hash of a string.

setlocale() function sets regional information (regional information).

rtrim() & rtrim() function

Related recommendations: "ThinkPHP Tutorial"

The above is the detailed content of What is the difference between PHP functions and methods?. For more information, please follow other related articles on the PHP Chinese website!