Ø chr()
- This function is used to convert the ascii code values into its character value.
Syntax
string chr(int ascii)
Example
<?php
echo chr(65);
?>
Output
A
Ø ord()
- Returns the ascii value of the first character of string.
Syntax
Int ord(string $string)
Example
<?php
echo ord(“H”);
?>
Output
104
Ø strtolower()
- Return string with all alphabetic character converted to lowercase.
Syntax
string strtolower(string $str)
Example
<?php
$str="Hello World";
echo strtolower($str);
?>
Output
hello world
Ø strtoupper()
- Return string with all alphabetic character converted to uppercase.
Syntax
string strtoupper(string $str)
Example
<?php
$str="Hello World";
echo strtoupper($str);
?>
Output
HELLO WORLD
Ø strlen()
- Return the length of the given string and 0 if the string is empty.
Syntax
int strlen(string $str)
Example
<?php
$str="Hello World";
echo strlen($str);
?>
Output
11
Ø ltrim()
- Strip white space or other character from the beginning of the string.
Syntax
string ltrim(string $str[,string $charlist])
Parameter | Description |
Str | The input string |
Charlist | You can also specify the character you want to strip means of the character list parameter. |
Example
<?php
$str="\t Hello World";
var_dump(ltrim($str));
?>
Output
string(11) "Hello World"
Ø rtrim()
- Strip white space from the end of a string.
Syntax
string rtrim(string $str[,string $charlist])
Example
<?php
$str="\t Hello World ";
var_dump(rtrim($str));
?>
Output
string(13) " Hello World"
Ø trim()
- The trim function removes a white space or other pre character striped from both side of a string.
Syntax
string trim(string $str[,string $charlist])
Example
<?php
$str="\t Hello World ";
var_dump(trim($str));
?>
Output
string(11) "Hello World"
Ø substr()
- The substr() returns a part of a string.
Syntax
string substr(string string, int start[, int length])
Parameter | Description |
String | Required. Specify the string to return a part of it. |
Start | Required, specifies where to start in the string. 1. A positive number start at a specified position in the string. 2. negative number start at a specified position from the end of the string 3. Zero start at the first character in string. |
Length | Optional, specifies the length of the return string default is the end of the string. |
Example
<?php
$str="Hello World";
echo substr($str,5);
?>
Output
World
Ø strcmp()
- The strcmp() compare two string.
This function returns.
1. zero : if the two string are equal.
2. <0 : if string1 is less than string2.
3. >0 : if string2 is greater than string2.
- Note: The strcmp() Is case sensitive function.
Syntax
int strcmp(string string1, string string2)
Example
<?php
$str1 ="Hello World";
$str2 ="Hello World";
echo strcmp($str1,$str2);
?>
Output
0
Ø strcasecmp()
- The strcasecmp() compare two string.
This function returns.
1. zero : if the two string are equal.
2. <0 : if string1 is less than string2.
3. >0 : if string2 is greater than string2.
- Note: The strcasecmp() Is case insensitive function.
Syntax
int strcasecmp(string string1, string string2)
Example
<?php
$str1 ="Hello";
$str2 ="hello";
echo strcasecmp($str1,$str2);
?>
Output
0
Ø strpos()
- Find position of first occurrence of a string.
Syntax
int strpos(string, find, start)
Parameter | Description |
String | Required, specify the string to search. |
Find | Required, specify the string to find. |
Start | Optional, specify where to begin the search. |
- Note: The strpos() Is case sensitive function.
Example
<?php
$str ="Hello";
echo strpos($str,"e");
?>
Output
1
Ø strrpos()
- Find the position of last occurrence of a string.
Syntax
int strrpos(string, find, start)
Parameter | Description |
String | Required, specify the string to search. |
Find | Required, specify the string to find. |
Start | Optional, specify where to begin the search. |
Example
<?php
$str ="Hello";
echo strrpos($str,"l");
?>
Output
3
Ø strstr()
- The strstr() search for the first occurrence of the string inside another string.
- The strstr() is case sensitive.
Syntax
string strstr(string, search)
Parameter | Description |
String | Required, specify the string to search. |
Search | Required, specify the string to search. |
Example
<?php
$str1 ="HeLlo world";
$str2 ="l";
echo strstr($str1,$str2);
?>
Output
lo world
Ø stristr()
- The strstr() search for the first occurrence of the string inside another string.
- The strstr() is case insensitive.
Syntax
string strstr(string, search)
Parameter | Description |
String | Required, specify the string to search. |
Search | Required, specify the string to search. |
Example
<?php
$str1 ="HeLlo world";
$str2 ="l";
echo strstr($str1,$str2);
?>
Output
Llo world
Ø str_replace()
- The str_replace() replace some character with some other character in a string.
This function works by the following rules.
- If the string to be search is an array, it retunes an array.
- If the string to be search is an array, find and replace is performed with every array element.
- If both find and replace are array and replace has fewer element then find, an empty string will be used as replace.
- If find is an array and replace is a string, the replace string will be used for every find value.
Syntax
mixed str_replace(find, replace, string, [count])
Parameter | Description |
Find | Required, specify the value to find. |
Replace | Required, specify the value to replace value in find. |
String | Required, specify the string to be search. |
Count | Optional, a variable that counts the no of replacement. |
Example
<?php
$arr =array("black","pink","white");
$str= str_replace("white","blue",$arr,$i);
print_r($str);
echo "<br/> Replacement : $i";
?>
Output
Array([0]=>black[1]=>pink[2]=>blue)
Replacement : 1
Replacement : 1
Ø strrev()
- The strrev() reverse a string.
Syntax
string strrev(string $string)
Example
<?php
$arr =array("black","pink","white");
$str= str_replace("white","blue",$arr,$i);
print_r($str);
echo "<br/> Replacement : $i";
?>
Output
dlroW olleH
Ø echo()
- The echo output one or more string.
Syntax
void echo(string $string)
Example
<?php
echo "Hello World";
?>
Output
Hello World
- Note : The echo() is not actually a function so you are not required to use parentheses with it.
Ø print()
- The print() output one or more string.
Syntax
void print(string $string)
Example
<?php
$str= "Hello World";
print ($str);
?>
Output
Hello World
- Note : The print() is not actually a function so you are not required to use parentheses with it.
Posted By : Hemangi Zala
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