PHP provides various string functions to access and manipulate strings. A list of important PHP string functions are given below.
PHP strtolower() function:
The strtolower() function returns string in lowercase letter.
<?php
$str="Welcome to Skptricks";
$str=strtolower($str);
echo $str;
?>
Output:-----------------
welcome to skptricks
PHP strtoupper() function:
The strtoupper() function returns string in uppercase letter.
<?php
$str="Welcome to Skptricks";
$str=strtoupper($str);
echo $str;
?>
output:------------------
WELCOME TO SKPTRICKS
PHP ucfirst() function:
The ucfirst() function returns string converting first character into uppercase. It doesn't change the case of other characters.
<?php
$str="Welcome to Skptricks";
$str=ucfirst($str);
echo $str;
?>
Output:-----------------
Welcome to Skptricks
PHP lcfirst() function:
The lcfirst() function returns string converting first character into lowercase. It doesn't change the case of other characters.
<?php
$str="Welcome to Skptricks";
$str=lcfirst($str);
echo $str;
?>
Output:----------------------
welcome to Skptricks
PHP strrev() function:
The strrev() function returns reversed string.
<?php
$str="Welcome to Skptricks";
$str=strrev($str);
echo $str;
?>
Output:----------------------------
skcirtpkS ot emocleW
Few more function to perform string operations:
| Function | Description |
| addcslashes() | Returns a string with backslashes in front of the specified characters |
| addslashes() | Returns a string with backslashes in front of predefined characters |
| bin2hex() | Converts a string of ASCII characters to hexadecimal values |
| chop() | Removes whitespace or other characters from the right end of a string |
| chr() | Returns a character from a specified ASCII value |
| chunk_split() | Splits a string into a series of smaller parts |
| convert_cyr_string() | Converts a string from one Cyrillic character-set to another |
| convert_uudecode() | Decodes a uuencoded string |
| convert_uuencode() | Encodes a string using the uuencode algorithm |
| count_chars() | Returns information about characters used in a string |
| crc32() | Calculates a 32-bit CRC for a string |
| crypt() | One-way string hashing |
| echo() | Outputs one or more strings |
| explode() | Breaks a string into an array |
| fprintf() | Writes a formatted string to a specified output stream |
| get_html_translation_table() | Returns the translation table used by htmlspecialchars() and htmlentities() |
| hebrev() | Converts Hebrew text to visual text |
| hebrevc() | Converts Hebrew text to visual text and new lines (\n) into <br> |
| hex2bin() | Converts a string of hexadecimal values to ASCII characters |
| html_entity_decode() | Converts HTML entities to characters |
| htmlentities() | Converts characters to HTML entities |
| htmlspecialchars_decode() | Converts some predefined HTML entities to characters |
| htmlspecialchars() | Converts some predefined characters to HTML entities |
| implode() | Returns a string from the elements of an array |
| join() | Alias of implode() |
| lcfirst() | Converts the first character of a string to lowercase |
| levenshtein() | Returns the Levenshtein distance between two strings |
| localeconv() | Returns locale numeric and monetary formatting information |
| ltrim() | Removes whitespace or other characters from the left side of a string |
| md5() | Calculates the MD5 hash of a string |
| md5_file() | Calculates the MD5 hash of a file |
| metaphone() | Calculates the metaphone key of a string |
| money_format() | Returns a string formatted as a currency string |
| nl_langinfo() | Returns specific local information |
| nl2br() | Inserts HTML line breaks in front of each newline in a string |
| number_format() | Formats a number with grouped thousands |
| ord() | Returns the ASCII value of the first character of a string |
| parse_str() | Parses a query string into variables |
| print() | Outputs one or more strings |
| printf() | Outputs 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 meta characters |
| rtrim() | Removes whitespace or other characters from the right side of a string |
| setlocale() | Sets locale information |
| sha1() | Calculates the SHA-1 hash of a string |
| sha1_file() | Calculates the SHA-1 hash of a file |
| similar_text() | Calculates the similarity between two strings |
| soundex() | Calculates the soundex key of a string |
| sprintf() | Writes a formatted string to a variable |
| sscanf() | Parses input from a string according to a format |
| str_getcsv() | Parses a CSV string into an array |
| str_ireplace() | Replaces some characters in a string (case-insensitive) |
| str_pad() | Pads a string to a new length |
| str_repeat() | Repeats a string a specified number of times |
| str_replace() | Replaces some characters in a string (case-sensitive) |
| str_rot13() | Performs the ROT13 encoding on a string |
| str_shuffle() | Randomly shuffles all characters in a string |
| str_split() | Splits a string into an array |
| str_word_count() | Count the number of words in a string |
| strcasecmp() | Compares two strings (case-insensitive) |
| strchr() | Finds the first occurrence of a string inside another string (alias of strstr()) |
| strcmp() | Compares two strings (case-sensitive) |
| strcoll() | Compares two strings (locale based string comparison) |
| strcspn() | Returns the number of characters found in a string before any part of some specified characters are found |
| strip_tags() | Strips HTML and PHP tags from a string |
| stripcslashes() | Unquotes a string quoted with addcslashes() |
| stripslashes() | Unquotes a string quoted with addslashes() |
| stripos() | Returns the position of the first occurrence of a string inside another string (case-insensitive) |
| stristr() | Finds the first occurrence of a string inside another string (case-insensitive) |
| strlen() | Returns the length of a string |
| strnatcasecmp() | Compares two strings using a "natural order" algorithm (case-insensitive) |
| strnatcmp() | Compares two strings using a "natural order" algorithm (case-sensitive) |
| strncasecmp() | String comparison of the first n characters (case-insensitive) |
| strncmp() | String comparison of the first n characters (case-sensitive) |
| strpbrk() | Searches a string for any of a set of characters |
| strpos() | Returns the position of the first occurrence of a string inside another string (case-sensitive) |
| strrchr() | Finds the last occurrence of a string inside another string |
| strrev() | Reverses a string |
| strripos() | Finds the position of the last occurrence of a string inside another string (case-insensitive) |
| strrpos() | Finds the position of the last occurrence of a string inside another string (case-sensitive) |
| strspn() | Returns the number of characters found in a string that contains only characters from a specified charlist |
| strstr() | Finds the first occurrence of a string inside another string (case-sensitive) |
| strtok() | Splits a string into smaller strings |
| strtolower() | Converts a string to lowercase letters |
| strtoupper() | Converts a string to uppercase letters |
| strtr() | Translates certain characters in a string |
| substr() | Returns a part of a string |
| substr_compare() | Compares two strings from a specified start position (binary safe and optionally case-sensitive) |
| substr_count() | Counts the number of times a substring occurs in a string |
| substr_replace() | Replaces a part of a string with another string |
| trim() | Removes whitespace or other characters from both sides of a string |
| ucfirst() | Converts the first character of a string to uppercase |
| ucwords() | Converts the first character of each word in a string to uppercase |
| vfprintf() | Writes a formatted string to a specified output stream |
| vprintf() | Outputs a formatted string |
| vsprintf() | Writes a formatted string to a variable |
| wordwrap() | Wraps a string to a given number of characters |
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