PHP String
A string is a sequence of letters, numbers, special characters and arithmetic values or combination of all. The simplest way to create a string is to enclose the string literal (i.e. string characters) in single quotation marks ('), like this:
$string = 'Hello World';
PHP String Functions
In this chapter we will look at some commonly used functions to manipulate strings.
strlen() - Return the Length of a String
The PHP strlen() function returns the length of a string.
Example:
<?php
echo strlen("Hello world!"); // outputs 12
?>
str_word_count() - Count Words in a String
The PHP str_word_count() function counts the number of words in a string.
Example:
<?php
echo str_word_count("Hello world!"); // outputs 2
?>
strrev() - Reverse a String
The PHP strrev() function reverses a string.
Example:
<?php
echo strrev("Hello world!"); // outputs !dlrow olleH
?>
strpos() - Search For a Text Within a String
The PHP strpos() function searches for a specific text within a string. If a match is found, the function returns the character position of the first match. If no match is found, it will return FALSE.
Example:
<?php
echo strpos("Hello world!", "world"); // outputs 6
?>
str_replace() - Replace Text Within a String
The PHP str_replace() function replaces some characters with some other characters in a string.
Example:
<?php
echo str_replace("world", "Elevenstech", "Hello world!"); // outputs Hello Elevenstech!
?>
PHP String Functions
The PHP string functions are part of the PHP core. No installation is required to use these functions.
- addcslashes() : Returns a string with backslashes in front of the specified characters
- addslashes() : Returns a string with backslashes in front of predefined characters
- bin2hex() : Converts a string of ASCII characters to hexadecimal values
- chop() : Removes whitespace or other characters from the right end of a string
- chr() : Returns a character from a specified ASCII value
- chunk_split() : Splits a string into a series of smaller parts
- convert_cyr_string() : Converts a string from one Cyrillic character-set to another
- convert_uudecode() : Decodes a uuencoded string
- convert_uuencode() : Encodes a string using the uuencode algorithm
- count_chars() : Returns information about characters used in a string
- crc32() : Calculates a 32-bit CRC for a string
- crypt() : One-way string hashing
- echo() : Outputs one or more strings
- explode() : Breaks a string into an array
- fprintf() : Writes a formatted string to a specified output stream
- get_html_translation_table() : Returns the translation table used by htmlspecialchars() and htmlentities()
- hebrev() : Converts Hebrew text to visual text
- hebrevc() : Converts Hebrew text to visual text and new lines (\n) into
- hex2bin() : Converts a string of hexadecimal values to ASCII characters
- html_entity_decode() : Converts HTML entities to characters
- htmlentities() : Converts characters to HTML entities
- htmlspecialchars_decode() : Converts some predefined HTML entities to characters
- htmlspecialchars() : Converts some predefined characters to HTML entities
- implode() : Returns a string from the elements of an array
- join() : Alias of implode()
- lcfirst() : Converts the first character of a string to lowercase
- levenshtein() : Returns the Levenshtein distance between two strings
- localeconv() : Returns locale numeric and monetary formatting information
- ltrim() : Removes whitespace or other characters from the left side of a string
- md5() : Calculates the MD5 hash of a string
- md5_file() : Calculates the MD5 hash of a file
- metaphone() : Calculates the metaphone key of a string
- money_format() : Returns a string formatted as a currency string
- nl_langinfo() : Returns specific local information
- nl2br() : Inserts HTML line breaks in front of each newline in a string
- number_format() : Formats a number with grouped thousands
- ord() : Returns the ASCII value of the first character of a string
- parse_str() : Parses a query string into variables
- print() : Outputs one or more strings
- printf() : Outputs a formatted string
- quoted_printable_decode() : Converts a quoted-printable string to an 8-bit string
- quoted_printable_encode() : Converts an 8-bit string to a quoted printable string
- quotemeta() : Quotes meta characters
- rtrim() : Removes whitespace or other characters from the right side of a string
- setlocale() : Sets locale information
- sha1() : Calculates the SHA-1 hash of a string
- sha1_file() : Calculates the SHA-1 hash of a file
- similar_text() : Calculates the similarity between two strings
- soundex() : Calculates the soundex key of a string
- sprintf() : Writes a formatted string to a variable
- sscanf() : Parses input from a string according to a format
- str_getcsv() : Parses a CSV string into an array
- str_ireplace() : Replaces some characters in a string (case-insensitive)
- str_pad() : Pads a string to a new length
- str_repeat() : Repeats a string a specified number of times
- str_replace() : Replaces some characters in a string (case-sensitive)
- str_rot13() : Performs the ROT13 encoding on a string
- str_shuffle() : Randomly shuffles all characters in a string
- str_split() : Splits a string into an array
- str_word_count() : Count the number of words in a string
- strcasecmp() : Compares two strings (case-insensitive)
- strchr() : Finds the first occurrence of a string inside another string (alias of strstr())
- strcmp() : Compares two strings (case-sensitive)
- strcoll() : Compares two strings (locale based string comparison)
- strcspn() : Returns the number of characters found in a string before any part of some specified characters are found
- strip_tags() : Strips HTML and PHP tags from a string
- stripcslashes() : Unquotes a string quoted with addcslashes()
- stripslashes() : Unquotes a string quoted with addslashes()
- stripos() : Returns the position of the first occurrence of a string inside another string (case-insensitive)
- stristr() : Finds the first occurrence of a string inside another string (case-insensitive)
- strlen() : Returns the length of a string
- strnatcasecmp() : Compares two strings using a "natural order" algorithm (case-insensitive)
- strnatcmp() : Compares two strings using a "natural order" algorithm (case-sensitive)
- strncasecmp() : String comparison of the first n characters (case-insensitive)
- strncmp() : String comparison of the first n characters (case-sensitive)
- strpbrk() : Searches a string for any of a set of characters
- strpos() : Returns the position of the first occurrence of a string inside another string (case-sensitive)
- strrchr() : Finds the last occurrence of a string inside another string
- strrev() : Reverses a string
- strripos() : Finds the position of the last occurrence of a string inside another string (case-insensitive)
- strrpos() : Finds the position of the last occurrence of a string inside another string (case-sensitive)
- strspn() : Returns the number of characters found in a string that contains only characters from a specified charlist
- strstr() : Finds the first occurrence of a string inside another string (case-sensitive)
- strtok() : Splits a string into smaller strings
- strtolower() : Converts a string to lowercase letters
- strtoupper() : Converts a string to uppercase letters
- strtr() : Translates certain characters in a string
- substr() : Returns a part of a string
- substr_compare() : Compares two strings from a specified start position (binary safe and optionally case-sensitive)
- substr_count() : Counts the number of times a substring occurs in a string
- substr_replace() : Replaces a part of a string with another string
- trim() : Removes whitespace or other characters from both sides of a string
- ucfirst() : Converts the first character of a string to uppercase
- ucwords() : Converts the first character of each word in a string to uppercase
- vfprintf() : Writes a formatted string to a specified output stream
- vprintf() : Outputs a formatted string
- vsprintf() : Writes a formatted string to a variable
- wordwrap() : Wraps a string to a given number of characters
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