What are the string manipulation methods in php?

String operation methods include: addcslashes(), chop(), chr(), crc32(), crypt(), echo(), explode(), fprintf(), hebrev(), join( ), ltrim(), md5(), nl2br(), etc.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

PHP String function (method) is the core of PHP component. No installation is required to use these functions.

String operation methods in php

##mb_substr() Returns the Chinese string part. substr_compare()Compares two strings starting at the specified starting position (binary safe and selective case sensitive). substr_count()Count the number of times a substring appears in a string. substr_replace()Replace part of a string with another string. trim()Remove whitespace characters and other characters on both sides of the string. ucfirst()Convert the first character in the string to uppercase. ucwords()Convert the first character of each word in the string to uppercase. vfprintf()Write the formatted string to the specified output stream. vprintf()Output formatted string. vsprintf()Write the formatted string into the variable. wordwrap()Wraps the string according to the specified length.

Function (method)	Description
addcslashes()	Returns before the specified character Add backslash to the string.
addslashes()	Returns a string with backslashes added before predefined characters.
bin2hex()	Convert a string of ASCII characters to a hexadecimal value.
chop()	Remove whitespace characters or other characters on the right side of the string.
chr()	Returns characters from the specified ASCII value.
chunk_split()	Split the string into a series of smaller parts.
convert_cyr_string()	Convert a string from one Cyrillic character set to another.
convert_uudecode()	Decode the uuencode encoded string.
convert_uuencode()	Encode a string using the uuencode algorithm.
count_chars()	Returns information about the characters used in the string.
crc32()	Calculate the 32-bit CRC (Cyclic Redundancy Check) of a string.
crypt()	One-way string encryption (hashing).
echo()	Output one or more strings.
explode()	Break up the string into an array.
fprintf()	Write the formatted string to the specified output stream.
get_html_translation_table()	Returns the translation table used by htmlspecialchars() and htmlentities().
hebrev()	Convert Hebrew text to visible text.
hebrevc()	Convert Hebrew text to visible text, and convert new lines (\n) to .
hex2bin()	Convert a string of hexadecimal values ​​to ASCII characters.
html_entity_decode()	Convert HTML entities to characters.
htmlentities()	Convert characters into HTML entities.
htmlspecialchars_decode()	Convert some predefined HTML entities into characters.
htmlspecialchars()	Convert some predefined characters into HTML entities.
implode()	Returns a string composed of array elements.
join()	An alias for implode().
lcfirst()	Convert the first character in the string to lowercase.
levenshtein()	Returns the Levenshtein distance between two strings.
localeconv()	Returns local number and currency format information.
ltrim()	Remove whitespace characters or other characters on the left side of the string.
md5()	Computes the MD5 hash of a string.
md5_file()	Calculate the MD5 hash of the file.
metaphone()	Calculate the metaphone key of a string.
money_format()	Returns a string formatted as a currency string.
nl_langinfo()	Return the specified local information.
nl2br()	Inserts an HTML newline character before each new line in the string.
number_format()	Format a number by thousands grouping.
ord()	Returns the ASCII value of the first character in the string.
parse_str()	Parse the query string into variables.
print()	Output one or more strings.
printf()	Output formatted string.
quoted_printable_decode()	Convert quoted-printable string to 8-bit string.
quoted_printable_encode()	Convert 8-bit string to quoted-printable string.
quotemeta()	Quote metacharacters.
rtrim()	Remove whitespace characters or other characters on the right side of the string.
setlocale()	Set regional information (regional information).
sha1()	Computes the SHA-1 hash of a string.
sha1_file()	Compute the SHA-1 hash of a file.
similar_text()	Calculate the similarity of two strings.
soundex()	Calculate the soundex key of a string.
sprintf()	Write the formatted string into a variable.
sscanf()	Parses input from a string according to the specified format.
str_getcsv()	Parse the CSV string into an array.
str_ireplace()	Replace some characters in the string (case insensitive).
str_pad()	Padding the string to the new length.
str_repeat()	Repeat the string the specified number of times.
str_replace()	Replace some characters in the string (case sensitive).
str_rot13()	Perform ROT13 encoding on a string.
str_shuffle()	Randomly shuffles all characters in the string.
str_split()	Split the string into an array.
str_word_count()	Count the number of words in a string.
strcasecmp()	Compares two strings (case insensitive).
strchr()	Find the first occurrence of a string in another string. (Alias ​​for strstr().)
strcmp()	Compares two strings (case sensitive).
strcoll()	Compares two strings (according to local settings).
strcspn()	Returns the number of characters searched in a string before any specified character is found.
strip_tags()	Strip HTML and PHP tags from strings.
stripcslashes()	Remove backslashes added by the addcslashes() function.
stripslashes()	Remove backslashes added by addslashes() function.
stripos()	Returns the position of the first occurrence of a string in another string (case insensitive).
stristr()	Find the first occurrence of a string in another string (case insensitive).
strlen()	Returns the length of the string. Chinese string processing uses the mb_strlen() function.
strnatcasecmp()	Uses a "natural ordering" algorithm to compare two strings (case insensitive).
strnatcmp()	Uses a "natural ordering" algorithm to compare two strings (case sensitive).
strncasecmp()	String comparison of the first n characters (case insensitive).
strncmp()	String comparison of the first n characters (case sensitive).
strpbrk()	Search for any one of the specified characters in the string.
strpos()	Returns the position of the first occurrence of a string in another string (case sensitive).
strrchr()	Find the last occurrence of a string in another string.
strrev()	Reverse a string.
strripos()	Find the last occurrence of a string in another string (case insensitive).
strrpos()	Find the last occurrence of a string in another string (case sensitive).
strspn()	Returns the number of specific characters contained in a string.
strstr()	Find the first occurrence of a string in another string (case sensitive).
strtok()	Split the string into smaller strings.
strtolower()	Convert the string to lowercase letters.
strtoupper()	Convert the string to uppercase letters.
strtr()	Convert specific characters in the string.
substr()	Returns a part of the string.

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