PHP find the first occurrence of a string in another string (case-sensitive) function Strpos ()

Instance

Find the location where "PHP" first appears in the string:

<?phpecho Strpos ("I love php, I love php too!", "PHP"); >

Definition and usage

The Strpos () F function finds the position of the first occurrence of a string in another string (case-sensitive).

Note: the Strpos () function is case-sensitive.

Note: This function is binary safe.

Related functions:

• Strrpos ()-Finds the last occurrence of a string in another string (case-sensitive)

• Stripos ()-finds the position of the first occurrence of a string in another string (case insensitive)

• Strripos ()-Finds the last occurrence of a string in another string (case insensitive)

Grammar

Strpos (String,find,start)

parameters	description
string	required. Specifies the string to be searched.
find	required. Specifies the character to find.
start	optional. Specify where to start the search.

Technical details

return value:	Returns the position of the first occurrence of a string in another string, or FALSE if no string is found. Note: The string position starts at 0, not from 1.
PHP version:	4 +

The return value of the Strpos () function returns False if not found, and returns 0 if the substring appears at first. In order to distinguish between 0 and false returned, you must use the equal operator = = = or!==.

    <?php    $mystring = ' ABCDE ';    $findme   = ' ab ';    $pos = Strpos ($mystring, $findme);    For    //Note our use of = = =.  Simply = = would not work as    expected    //because the position of ' AB ' is the 0th (first) character.    /    /Here is used constant equals = = =, if use = = words can not get the expected result of the *    //Because the string ab is the No. 0 character starting from the    if ($pos = = = False)    11    {        echo "The string ' $findme ' is not found in the string ' $mystring '";    +    else    , {        echo "the string ' $findme ' was found in the string ' $mystring '" ;        echo "and exists at position $pos";    ?>

Program output:

The string ' ab ' is found in the string ' ABCDE ' and exists at position 0