PHP String Functions
These functions enable operations such as searching, replacing, formatting, splitting, and comparing strings, among other tasks.
Below is a categorized list of PHP string functions based on their functionality.
String Manipulation and Formatting
| Functions | Description |
|---|---|
| addslashes() | Escape Special Characters |
| chop() | Remove blank space at the end of the string |
| chunk_split() | Break string after a position |
| str_split() | Split a string with fixed intervals (without using any delimiter) |
| str_pad() | Padding string from left, right, or both sides |
| strrev() | Reversing a string |
| stripslashes() | to Remove Backslashes |
| sprintf() | Formatting strings for numbers, and other data types |
| nl2br() | Converting line breaks to HTML <BR> tags |
| str_shuffle() | Shuffle a string |
| str_repeat() | Repeat a string multiple times |
| trim() | Removing char or blank space from left, right, and both sides of a string |
| wordwrap() | Wrapping the string after a width |
String Search and Substring Extraction
| Functions | Description |
|---|---|
| strpos() | Case-sensitive search returns position of the first occurrence |
| stripos() | Case-insensitive search returns position of the first occurrence |
| strrpos() | Case-sensitive search returns position of the last occurrence |
| strripos() | Case-insensitive search returns position of the last occurrence |
| strchr() | Return the substring from the matching point |
| strrchr() | Find the last occurrence of a character and return the substring |
| strstr() | Search for string with needle (case-sensitive) |
| stristr() | Search for string with needle (case-insensitive) |
| substr() | Extract part of the string based on position and length |
| substr_count() | Count the number of times a substring occurs in a string |
String Replacement
| Functions | Description |
|---|---|
| str_replace() | Case-sensitive string replacement |
| str_ireplace() | Case-insensitive string replacement |
| preg_replace() | Regular expression string replacement |
String Case Conversion
| Functions | Description |
|---|---|
| strtolower() | Convert all characters to lowercase |
| strtoupper() | Convert all characters to uppercase |
| lcfirst() | Convert the first character to lowercase |
| ucfirst() | Convert the first character to uppercase |
| ucwords() | Convert the first character of every word to uppercase |
String Comparison
| Functions | Description |
|---|---|
| strcasecmp() | Case-insensitive string comparison |
| strcmp() | Case-sensitive string comparison |
| strcoll() | locale-based string comparison |
| similar_text() | Comparing strings to get the percentage of similarity |
String Operations with Arrays and Delimiters
| Functions | Description |
|---|---|
| explode() | Break a string into an array using a delimiter |
| implode() | Join array elements into a string |
| split() | Break a string using a delimiter |
ASCII and Character Functions
| Functions | Description |
|---|---|
| chr() | Return a character from an ASCII value |
| ord() | Return the ASCII value of a character |
| count_chars() | Return information about the characters used in a string |
Encryption and Hashing
| Functions | Description |
|---|---|
| md5() | String encryption using MD5 hash |
| password_hash() | One-way password hash |
| password_verify() | Verify a string against a password hash |
| random_bytes() | Cryptographically secure random bytes (PHP 7+) |
| mcrypt() | provide encryption functions ( DEPRECATED ) |
HTML and Special Characters
| Functions | Description |
|---|---|
| htmlspecialchars() | Convert special HTML characters to their entities |
| strip_tags() | Remove HTML tags from a string |
CSV Handling
| Functions | Description |
|---|---|
| fgetcsv() | Get data from a CSV file |
| fputcsv() | Write data to a CSV file |
Miscellaneous Functions
| Functions | Description |
|---|---|
| addcslashes() | Add slashes to specific characters |
| str_word_count() | Count the words in a string |
| strlen() | Return the length of a string |
Scripts using String functions in PHP
PalindromeCheck the input string is Palindrome or not
ctype_lower() & ctype_upper()
checking presence of lower or upper case letter only.
Checking String
Checking string for presence of Upper case or lower case letter or special characters or space.
Random string
We can generate random string by using rand function
Removing chars from end
Remove chars from end of the string by using length and sub string functions
Adding strings
Add two or more strings including date.
Collecting part of string
Extracting string part using two landmark points
Email part
Getting the domain and Userid part from an email address
Questions
- What is the purpose of the
strlen()function in PHP? How do you use it? - How can you convert a string to all uppercase letters using a PHP string function?
- Explain the difference between
strpos()andstripos()functions in PHP. - How can you extract a substring from a given string using the
substr()function in PHP? - What is the purpose of the
str_replace()function in PHP? Provide an example of how you would use it. - How do you check if a string starts with a specific substring in PHP? Which string function would you use?
- How can you concatenate two strings in PHP? Is there a specific function for that?
- What is the purpose of the
trim()function in PHP? How does it differ fromltrim()andrtrim()? - How can you split a string into an array of substrings based on a specific delimiter using a PHP string function?
- Explain the purpose and usage of the
str_shuffle()function in PHP.
Subhendu Mohapatra
Author
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| satish | 13-03-2013 |
| Its good information | |
