The most comprehensive php string processing function

PHP’s string processing function is very powerful. As a PHP programmer, we need to understand what PHP string processing functions are and how to use them. In this article, we will make a general summary of the PHP string processing functions. These are the PHP string processing functions that come with the system.

addcslashes — Add backslash escape characters to some characters in the string
addslashes — Use the specified method to escape the characters in the string
bin2hex — Convert binary data to hexadecimal System representation
chop — Alias ​​function of rtrim()
chr — Returns the ASCII code of a character
chunk_split — Splits a string into small chunks according to a certain character length
convert_cyr_string — Converts Cyrillic characters Convert to other characters
convert_uudecode — Decrypt a string
convert_uuencode — Encrypt a string
count_chars — Return the character usage information in a string
crc32 — Calculate the crc32 polynomial of a string
crypt — One-way hash encryption function
echo — Used to display some content
explode — Convert a string into an array form using a delimiter
fprintf — Return the data as required, and Write directly to the document stream
get_html_translation_table — Returns an HTML entity that can be converted
hebrev — Converts a Hebrew-encoded string to visual text
hebrevc — Converts a Hebrew-encoded string to visual text
html_entity_decode — The inverse function of the htmlentities () function, converts HTML entities into characters
htmlentities — Converts some characters in the string into HTML entities
htmlspecialchars_decode — The inverse function of the htmlspecialchars() function, converts HTML entities Convert to characters
htmlspecialchars — Convert some characters in a string to HTML entities
implode — Convert an array into a string using a specific delimiter
join — Convert an array into a string, implode() function Alias ​​
levenshtein — Calculate the difference between two words
localeconv — Get number-related format definitions
ltrim — Remove the blanks or specified characters on the left side of the string
md5_file — Convert a file MD5 algorithm encryption
md5 — Encrypt a string with MD5 algorithm
metaphone — Determine the pronunciation rules of a string
money_format — Format the output of numbers according to parameters
nl_langinfo — Query language and Local information
nl2br — Replace the newline character "/n" in the string with "
"
number_format — Format the output of a number according to the parameter
ord — Replace an ASCII Convert the code into a character
parse_str — Convert a string in a certain format into a variable and value
print — Used to output a single value
printf — Display the data as required
quoted_printable_decode — Will A string is encrypted into an 8-bit binary string
quotemeta — Escape several specific characters
rtrim — Remove the blanks or specified characters on the right side of the string
setlocale — Set about numbers, Local format of date, etc.
sha1_file — Encrypt a file with SHA1 algorithm
sha1 — Encrypt a string with SHA1 algorithm
similar_text — Compare two strings and return the number of similar characters considered by the system
soundex — Determine the pronunciation rules of a string
sprintf — Return the data as required, but do not output
sscanf — You can format the string
str_ireplace — Like the str_replace() function Match and replace strings, but case-insensitive
str_pad — pad both sides of a string
str_repeat — repeat combinations of strings
str_replace — match and replace strings
str_rot13 — Encrypt the string with ROT13
str_shuffle — Randomly sort the characters in a string
str_split — Split a string into an array according to the character spacing
str_word_count — Get the English words in the string Info
strcasecmp — Compares strings by size, case-insensitive
strchr — Alias ​​for the strstr() function that returns part of a string by comparison
strcmp — Compares strings by size
strcoll – Compare the size of strings according to local settings
strcspn – Return the value of the consecutive non-matching length of characters
strip_tags – Remove HTML and PHP code in a string
stripcslashes – Unescap addcslashes() Function escapes the processed string
stripos — Finds and returns the position of the first match, matching is case-insensitive
stripslashes — Unescapes the addslashes() function escapes the processed string
stristr — Returns parts of a string by comparison, case-insensitive
strlen — Gets the encoded length of a string
strnatcasecmp — Compares strings using natural ordering, case-insensitive
strnatcmp — Compare the size of strings using natural sorting
strncasecmp — Compare the size of the first N characters of a string, case-insensitive
strncmp — Compare the size of the first N characters of a string Compare
strpbrk — Returns a portion of a string by comparing it
strpos — Finds and returns the position of the first match
strrchr — Returns a portion of a string by comparing it backwards
strrev — Arrange all letters in the string in reverse order
strripos — Search from back to front and return the position of the first match, matching is not case-sensitive
strrpos - Search backwards and return the position of the first match
strspn - Match and return the value of the length of consecutive occurrences of characters
strstr - Return a portion of a string by comparison
strtok - Use the specified Several characters to split the string
strtolower - Convert the string to lowercase
strtoupper - Convert the string to uppercase
strtr - Compare and replace the string
substr_compare - After intercepting the string Comparison
substr_count — Count the number of occurrences of a certain character segment in a string
substr_replace — Replace some characters in the string
substr — Truncate the string
trim — Remove both sides of the string Blanks or specified characters
ucfirst — Convert the first letter of the given string to uppercase
ucwords — Convert the first letter of each English word in the given string to uppercase
vfprintf — Returns data as required and writes directly into the document stream
vprintf — Displays data as required
vsprintf — Returns data as required, but does not output
wordwrap — According to certain characters Length split string

The above is a summary of PHP string processing functions, I hope it will be helpful to everyone.

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