PHP String Functions

A string is a combination of characters and string functions in a programming language are used to manipulate strings. For example:

$string = “PHP string handling functions.”;

Difference between single and double quoted strings in Php

In single quoted strings, variables are not interpreted and the whole string is printed as it is. However, in double quoted strings PHP has to parse the variables, examine their values and print accordingly.

Code example

<?php
	$var = “Sehaj Kaur”;
	echo  ‘My name is $var <br>‘;	//single quoted
	echo “My name is $var”;	//double quoted
?>

Test Yourself

Escape sequencing in Php:

Escape sequences are used to escape a character while string parsing and giving an additional meaning to it like line breaks, tabs etc. Escape sequences work in double quote strings. Escape sequences start with a backslash() followed by a character. Escape sequences used in PHP are as follows:

`’`	Is replaced by a single quote
`”`	Is replaced by a double quote
	To add line breaks within string
	To add tab space
	For carriage return
`$`	Is replaced by a dollar sign itself

Code example

<?php
	echo "\"PHP Programming.\"";

	//output will be:
	// "PHP Programming."

?>

Test Yourself

Php string handling functions

Function Name	Description
addcslashes	Returns a string after adding backslashes in front of mentioned character `addcslashes(string, characters). //syntax`
addslashes	Returns a string after adding backslashes in front of predefined characters `(‘,”,,NULL)` `addslashes(string) //syntax`
bin2hex	Converts binary to hexadecimal `bin2hex(string) //syntax`
chop	Removes whitespace or any other predefined character from the right end of a string `chop(string, character_list) //syntax`
chr	Converts a number to single-byte string `chr(ascii_code) //syntax`
chunk_split	Splits a string into smaller chunks `chunk_split(string, string_length, end) //syntax`
convert_cyr_string	Converts one cyrillic character set to another `convert_cyr_string(string, string_length, end) //syntax`
convert_uudecode	Decodes uuencoded string `convert_uudecode(string) //syntax`
convert_uuencode	Encodes the string in uuencode algorithm of encoding convert_uuencode(string) //syntax
count_chars	Information about characters used in the string `count_chars(string, mode) //syntax`
crc32	Calculates crc32 of a string `crc32(string) //syntax`
crypt	One way string hashing `crypt(string, salt) //syntax`
echo	Output data or result on screen `echo(string) //syntax`
explode	Splits a string into an array `explode(separator,string, limit) //syntax`
fprintf	Writes a formatted string to any stream `fprintf(stream,format,argument1, argument2, argument++) //syntax`
get_html_translation_table	Returns the translation table used by htmlspecialchars and htmlentities get_html_translation_table(table, flag, encoding) //syntax
hebrev	Converts hebrew text to visual text `hebrev(string, max_chars_per_line) //syntax`
hebrevc	Converts hebrew text to visual text and to `<br>` `hebrevc(string, max_chars_per_line) //syntax`
hex2bin	Converts hexadecimal to binary `hex2bin(string) //syntax`
html_entity_decode	Converts html entities to characters `html_entity_decode(string, flag, encoding) //syntax`
htmlentities	Converts characters to html entities `htmlentities(string, flag, encoding, double_encode) //syntax`
htmlspecialchars_decode	Converts special HTML entities to characters `htmlspecialchars_decode(string, flag) //syntax`
htmlspecialchars	Converts special characters to HTML entities `htmlspecialchars(string, flag, encoding, double_encode) //syntax`
implode	Binds an array into a string implode(binder, array) //syntax
join	Binds an array into a string `join(binder, array) //syntax`
lcfirst	Converts first character of a string to lowercase
levenshtein	Returns the levenshtein distance between two strings.Number of characters that will be replaced to transform string1 to string 2.
localeconv	Returns numeric formatting information
ltrim	Removes whitespace and other predefined characters from the left side of a string
md5	Calculates md5 hash of a string
md5_file	Calculates md5 hash of a file
metaphone	Calculates metaphone key of a string
money_format	Formats a number as currency
nl_langinfo	Locale information
nl2br	Inserts HTML line breaks in front of all new lines
number_format	Formats to number
ord	Returns the ASCII value of the first character of the string
parse_str	To parse a query string to a variable
print	Used to output string
printf	Prints 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 metacharacters
rtrim	Removes the whitespace or specified characters from the right side of the string
setlocale	Sets the locale information
sha1	Calculates the SHA-1 hash of a string
sha1_file	Calculates the SHA-1 hash of a file
similar_text	Checks for the similarity between two strings
soundex	Calculates the soundex key of a string
sprintf	Returns a formatted string
sscanf	Converts input from a string as per the given format
str_getcsv	Converts CSV string into an array
str_ireplace	Case insensitive while replacing some characters in a string.
str_pad	Pads a string to specified length
str_repeat	Repeats a string for a specified number of times
str_replace	Replaces specified characters in a string
str_rot13	Encodes a string by ROT13 method
str_shuffle	Shuffles a string randomly
str_split	Splits a string into an array
str_word_count	Counts the number of words in a string
strcasecmp	Case insensitive string comparison
strchr	Checks for the first occurrence of the string
strcmp	Case sensitive string comparison
strcoll	Locale based string comparison
strcspn	Returns the count of numbers found in a string before a matching mask
strip_tags	Strips HTML and PHP tags from a string
stripcslashes	Unquotes a string being quoted by addcslashes
stripslashes	Unquotes a quoted string
stripos	Case insensitive search of a string for the first occurrence of a string inside another
stristr	Case-insensitive search for the first occurrence of a string inside another string.
strlen	Returns the length of string
strnatcasecmp	Case insensitive comparison of two strings using Natural Order Algorithm
strnatcmp	Case sensitive comparison of two strings using Natural Order Algorithm
strncasecmp	Case insensitive comparison of strings for first n characters
strncmp	Case sensitive comparison of strings for first n characters
strpbrk	Search a string for any set of characters
strpos	Checks a string for the position of first occurrence of a specified string. Searching is case sensitive
strrchr	Checks a string for the last occurrence of a specified string
strrev	Reverse the string
strripos	Checks a string for the position of last occurrence of a specified string. Searching is case insensitive
strrpos	Checks a string for the position of last occurrence of a specified string. Searching is case sensitive
strspn	Returns the number of characters found in a string which has characters from specified charlist
strstr	Checks for the first occurrence of the string
strtok	Tokenize the string
strtolower	Converts whole string to lowercase
strtoupper	Converts whole string to UPPERCASE
strtr	Translate characters to string
substr	Returns a part of the string
substr_compare	Compare two strings with defined start position
substr_count	Count the number of substring existence in a string
substr_replace	Replaces substring with a defined string
trim	Removes whitespace and predefined characters from both sides of a string
ucfirst	Converts the first character of string to uppercase
ucwords	Converts the first character of each word in a string to uppercase
vfprintf	Writes a formatted string to a stream
vprintf	Prints a formatted string
vsprintf	Returns a formatted string
wordwrap	Wraps a string to a mentioned number of characters

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PHP String Functions

Difference between single and double quoted strings in Php

Code example

Escape sequencing in Php:

Code example

Php string handling functions

Help Us to Improve our content

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PHP String Functions

Difference between single and double quoted strings in Php

Code example

Escape sequencing in Php:

Code example

Php string handling functions

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