| Number | Function | Description |
| 1 | addcslashes() | This will return string with backslashes. |
| 2 | addslashes() | This will used to return string with backslashes. |
| 3 | bin2hex() | This will used to convert string of ASCII characters to hexadecimal values. |
| 4 | chop() | This will removes whitespace or some other characters from right end of string given. |
| 5 | chr() | This will used to return character from a specified ASCII value. |
| 6 | chunk_split() | This will be used to split string into a series of smaller parts. |
| 7 | convert_cyr_string() | We use this function to convert string from one Cyrillic character-set to another. |
| 8 | convert_uudecode() | We use this to decode a uuencoded string. |
| 9 | convert_uuencode() | We used this to encode a string using the uuencode algorithm. |
| 10 | count_chars() | We used this to return information about characters used in a string. |
| 11 | crc32() | We used this to calculate a 32-bit CRC for a string. |
| 12 | crypt() | We used this to create hashing string One-way. |
| 13 | echo() | We used this for output one or more strings. |
| 14 | explode() | We used this to break a string into an array. |
| 15 | fprint() | We used this to write a formatted string to a stream. |
| 16 | get_html_translation_table() | We used this to returns translation table which is used by htmlspecialchars() and htmlentities(). |
| 17 | hebrev() | We used to convert Hebrew text to visual text. |
| 18 | hebrevc() | We used this to convert Hebrew text to visual text and new lines ("\n") into < br>. |
| 19 | hex2bin() | We used to convert string of hexadecimal values to ASCII characters. |
| 20 | htmlentities() | We used this to convert character to HTML entities. |
| 21 | html_entity_decode() | We used this to convert HTML entities to characters. |
| 22 | htmlspecialchars() | We used this to converts the special characters to html entities. |
| 23 | htmlspecialchars_decode() | We used this to converts the html entities back to special characters. |
| 24 | Implode() | We used this to return a string from the elements of an array. |
| 25 | Join() | We used this as an Alias of implode() function. |
| 26 | Levenshtein() | We used this to return the Levenshtein distance between two strings. |
| 27 | Lcfirst() | We used this to convert the first character of a string to lowercase. |
| 28 | localeconv() | We used this to Get numeric formatting information |
| 29 | ltrim() | We used this to remove whitespace from the left side of a string. |
| 30 | md5() | We used this to calculate the MD5 hash of a string. |
| 31 | md5_files() | We used this to calculate MD5 hash of a file. |
| 32 | metaphone() | We used this to calculate the metaphone key of a string. |
| 33 | money_format() | We used this to string formatted as a currency string. |
| 34 | nl2br() | We used this to insert HTML line breaks in front of each newline in a string. |
| 35 | nl_langinfo() | We used this for Query language and locale information |
| 36 | number_format() | We used this to format a number with grouped thousands. |
| 37 | ord() | We used this to return ASCII value of the first character of a string. |
| 38 | parse_str() | We used this to parse a query string into variables. |
| 39 | print() | We used this for output one or more strings. |
| 40 | printf() | We used this to show output as a formatted string. |
| 41 | quoted_printable_decode() | We used to converts quoted-printable string to an 8-bit string |
| 42 | quoted_printable_encode() | We used this to converts the 8-bit string back to quoted-printable string |
| 43 | quotemeta() | We used this for Quote meta characters |
| 44 | rtrim() | We used this to remove whitespace from the right side of a string. |
| 45 | setlocale() | We used this to set locale information. |
| 46 | sha1() | We used this to return the SHA-1 hash of a string. |
| 47 | sha1_file() | We used this to return the SHA-1 hash of a file. |
| 48 | similar_text() | We used this to compare the similarity between two strings. |
| 49 | Soundex() | we used this to calculate the soundex key of a string. |
| 50 | sprintf() | We used this to return a formatted string |
| 51 | sscanf() | We used this to parse input from a string according to a format. |
| 52 | strcasecmp() | We used to compare two strings. |
| 53 | strchr() | We used this to find the first occurrence of a string inside another string. |
| 54 | strcmp() | We used this for binary safe string comparison (case-sensitive) |
| 55 | strcoll() | We used this for Locale based binary comparison(case-sensitive) |
| 56 | strcspn() | We used this to reverses a string. |
| 57 | stripcslashes() | We used this to unquote a string quoted with addcslashes(). |
| 58 | stripos() | We used this to return the position of the first occurrence of a string inside another string. |
| 59 | stristr() | We used this for Case-insensitive strstr. |
| 60 | strlen() | We used this to return the length of a string. |
| 61 | strncasecmp() | We used this for binary safe case-insensitive string comparison |
| 62 | strnatcasecmp() | We used this for case-insensitive comparison of two strings using a "natural order" algorithm |
| 63 | strnatcmp() | We used this for case-sensitive comparison of two strings using a "natural order" algorithm |
| 64 | strncmp() | We used this to compare of the first n characters. |
| 65 | strpbrk() | We used this to search a string for any of a set of characters. |
| 66 | strripos() | This is used to finds the position of the last occurrence of a case-insensitive substring in a string. |
| 67 | strrpos() | This is used to finds the length of the last occurrence of a substring in a string. |
| 68 | strpos() | We used this to return the position of the first occurrence of a string inside another string. |
| 69 | strrchr() | We used this to find the last occurrence of a string inside another string. |
| 70 | strrev() | We used this to reverse a string. |
| 71 | strspn() | This is used to find the initial length of the initial segment of the string |
| 72 | strstr() | We used this to find the occurrence of a string. |
| 73 | strtok() | This is used to splits the string into smaller strings |
| 74 | strtolower() | we used this to Convert the string in lowercase |
| 75 | strtoupper() | We used this to convert the strings in uppercase |
| 76 | strtr() | This is used to translate certain characters in a string or replace the substring |
| 77 | str_getcsv() | We used this to parse a CSV string into an array. |
| 78 | str_ireplace() | We used this to replace some characters in a string (case-insensitive). |
| 79 | str_pad() | We used this to pad a string to a new length. |
| 80 | str_repeat() | We used this to repeat a string a specified number of times. |
| 81 | str_replace() | We used this to replaces all occurrences of the search string with the replacement string. |
| 82 | str_rot13() | We used this to perform the ROT13 encoding on a string. |
| 83 | str_shuffle() | We used this to randomly shuffle all characters in a string. |
| 84 | str_split() | We used this to split a string into an array. |
| 85 | strcoll() | This is used to locale based string comparison. |
| 86 | strip_tags() | We used this to strip HTML and PHP tags from a string. |
| 87 | str_word_count() | We used this to count the number of words in a string. |
| 88 | substr() | We used this to return the part of a string |
| 80 | substr_compare() | We used this to compares two strings from an offset up to the length of characters. (Binary safe comparison) |
| 90 | substr_count() | We used this to count the number of times occurrence of a substring |
| 91 | substr_replace() | We used this to replace some part of a string with another substring |
| 92 | trim() | We used this to remove whitespace or other characters from the beginning and end of the string. |
| 93 | ucfirst() | We used this to make the first character of the string to uppercase |
| 94 | ucwords() | We used this to make the first character of each word in a string to uppercase |
| 95 | vfprintf() | We used this to write a formatted string to a stream |
| 96 | vprintf() | This is used to display the output as a formatted string according to format |
| 97 | vsprintf() | We will use this to returns a formatted string |
| 98 | wordwrap() | This is used to wraps a string to a given number of characters |