strripos() Position of last occurence of a case insensitive search string with offset

Find the last position without case sensitivity

strripos() finds the last case-insensitive occurrence of a substring and returns its integer position or false.

$text = 'PHP and php';
$position = strripos($text, 'PHP');
if ($position !== false) {
    echo $position; // 8
}

Start with this current pattern. The examples below are retained, corrected where necessary, and expanded for additional variations and output.

$position=strripos("Welcome to plus2et.com",'M');
echo $position; // Optput is 21

echo strripos("Welcome to plus2et.com",'CO');  // Output is 19

$int_position=strripos(Main_string, Search_string,[optional: offset =0 ]);

Main_string : The string inside of which the search_string will be searched.
search_strig : This is searched within the Main_string.
offset : (optional, integer ) Starting point of search but position count is returned from beginning or ending of the string. Negative integer is allowed to search from end of the string in PHP version 7.0.1

Using Offset

Note that first position is 0 ( zero ) .
Position of last occurrence is returned starting from beginning of the string . This counting of position is irrespective of given offset. If position is given negative then search will start by leaving that many characters from end of the string in backward direction.

echo strripos("Welcome to plus2et.com",'E'); // Output is 16
echo strripos("Welcome to plus2et.com",'E',3); // Output is 16
echo strripos("Welcome to plus2et.com",'C',-1); // Output is 19
echo strripos("Welcome to plus2et.com",'C',-4); // Output is 3
echo strripos("Welcome to plus2et.com",'O',-1); // Output is 20
echo strripos("Welcome to plus2et.com",'O',-4); // Output is 9
echo strripos("Welcome to plus2et.com",'E',-4); // Output is 16 
echo strripos("Welcome to plus2et.com",'E',-7); // Output is 6

Checking return value

We may get Boolean value as false and it may also return non-Boolean value. We need to evaluate the return value using === operator or !== to get the correct output. Check this code below and the outputs

$position=strripos("Welcome",'z'); 
if($position==false){
echo " Not found ";	
}else{
echo " Found and position = ".$position;	
}
// Output is Not found

Using the same code we will search for string W

$position=strripos("Welcome",'w'); 
if($position==false){
echo " Not found ";	
}else{
echo " Found and position = ".$position;	
}
// Output is Not found

The search string is already present at position 0 . Above code need to change like this to get correct output.

$position=strripos("Welcome",'w'); 
if($position===false){
echo " Not found ";	
}else{
echo " Found and position = ".$position;	
} // Output is Found and position = 0

Use === or !== to test the return value

case-insensitive

strripos() is case insensitive

$position=strripos("Welcome",'M'); 
if($position===false){
echo " Not found ";	
}else{
echo " Found and position = ".$position;	
} // Found and position = 5

strpos() case-sensitive search returns position of first occurence
stripos() case-insensitive search returns position of first occurence
strrpos() case-sensitive search returns position of last occurence

String Functions stristr(): String search str_replace(): String replace

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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strripos() : Position of last occurence of the case insensitive search string

Find the last position without case sensitivity

Using Offset

Checking return value

case-insensitive

Subhendu Mohapatra