A summary of 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 a string
addslashes — Escape characters in a string in a specified way
bin2hex — Convert binary data to hexadecimal representation
chop — alias function for rtrim()
chr — Returns the ASCII code of a character
chunk_split — Split a string into small chunks according to a certain character length
convert_cyr_string — Convert Cyrillic characters to other characters
convert_uudecode — Decrypt a string
convert_uuencode — Encrypt a string
count_chars — Returns character usage information in a string
crc32 — Compute 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 using delimiters
fprintf — Return data as required and write directly to the document stream
get_html_translation_table — Returns HTML entities that can be translated
hebrev — Convert a Hebrew-encoded string to visual text
hebrevc — Convert a Hebrew-encoded string to visual text
html_entity_decode — Inverse function of htmlentities () function, converts HTML entities to characters
htmlentities — Convert some characters in a string to HTML entities
htmlspecialchars_decode — The inverse function of htmlspecialchars() function, converts HTML entities into characters
htmlspecialchars — Convert some characters in a string to HTML entities
implode — Convert an array into a string using a specific delimiter
join — Convert array to string, alias of implode() function
levenshtein — Calculate the difference between two words
localeconv — Get number-related format definitions
ltrim — removes whitespace on the left side of a string or specified characters
md5_file — Encrypt a file with MD5 algorithm
md5 — Encrypt a string using the MD5 algorithm
metaphone — Determine the pronunciation rules of a string
money_format — Output of numbers formatted according to arguments
nl_langinfo — Query language and locale information
nl2br — Replace newline character "/n" in a string with "
"
number_format — Output of numbers formatted according to parameters
ord — Convert an ASCII code to a character
parse_str — Convert strings in a certain format into variables and values ??
print — used to print a single value
printf — display data as required
quoted_printable_decode — Encrypt a string into an 8-bit binary string
quotemeta — escape several specific characters
rtrim — removes whitespace or specified characters
from the right side of a string setlocale — Set local formats for numbers, dates, etc.
sha1_file — Encrypt a file with SHA1 algorithm
sha1 — Encrypt a string with SHA1 algorithm
similar_text — Compares two strings and returns the number of similar characters considered by the system
soundex — Determine the pronunciation rules of a string
sprintf — returns data as required, but does not output
sscanf — can format strings
str_ireplace — Matches and replaces strings like the str_replace() function, but is case-insensitive
str_pad — padding on both sides of a string
str_repeat — Repeat combination of strings
str_replace — Match and replace strings
str_rot13 — Encrypt a string with ROT13
str_shuffle — Randomly sort the characters in a string
str_split — Split a string into an array according to character spacing
str_word_count — Get the English word information in the string
strcasecmp — Compare strings, case-insensitively
strchr — Alias ??for the strstr() function that returns a portion of a string by comparison
strcmp — Compare string sizes
strcoll – Compare string sizes based on local settings
strcspn — Returns the value of the consecutive non-matching length of characters
strip_tags — Remove HTML and PHP code from a string
stripcslashes — Unescaping strings processed by the addcslashes() function
stripos — Find and return the position of the first match, matching is case-insensitive
stripslashes — Anti-escaping the strings processed by the addslashes() function
stristr — Returns parts of a string by comparison, case-insensitive
strlen — Get the encoded length of a string
strnatcasecmp — Compare strings using natural ordering, case-insensitive
strnatcmp — Size comparison of strings using natural ordering
strncasecmp — Compare the first N characters of a string, case-insensitive
strncmp — Compare the size of the first N characters of a string
strpbrk — Returns parts of a string by comparison
strpos — Find and return the position of the first match
strrchr — Returns a portion of a string
by comparing it backwards and forwards strrev — Reverse all letters in a string
strripos — Search backwards and return the position of the first match, matching is not case sensitive
strrpos – searches backward and returns the position of the first match
strspn — Match and return the value of the length of consecutive occurrences of characters
strstr — Returns parts of a string
by comparison strtok — Split a string using specified characters
strtolower — Convert a string to lowercase
strtoupper – Convert a string to uppercase
strtr — compare and replace strings
substr_compare — Compare strings after truncation
substr_count — Count the number of occurrences of a certain character segment in a string
substr_replace — Replace some characters in a string
substr — intercept a string
trim — Remove whitespace or specified characters
on both sides of a string ucfirst — Convert the first letter of the given string to uppercase
ucwords — Capitalize the first letter of each English word in the given string
vfprintf — Return data as required and write directly to the document stream
vprintf — display data as required
vsprintf — Returns data as required, but does not output
wordwrap — Split strings according to a certain character length

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