Character search function in php_PHP tutorial

stristr() function finds the first occurrence of a string within another string.

If successful, returns the rest of the string (from the point of the match). If the string is not found, returns false.

Grammar
stristr(string,search)
*/
$str="hello world"; //Define string
$result=stristr($str,"w"); //Perform search operation
echo $result; //Output the search results, "world"

/*

The stripos() function returns the position of the first occurrence of a string within another string.

If the string is not found, return false.

Grammar
stripos(string,find,start)

*/

$str="hello world"; //Define string
$result=stripos($str,"w"); //Perform search operation
echo $result;                         // Output the search results, 6

/*
*/
$str="hello world"; //Define string
$result=stripos($str,"l"); //Perform search operation
echo $result;                                        // Output the search results, will return 2

/*
The strspn() function returns the number of specific characters contained in a string.

Grammar
strspn(string,charlist,start,length)
*/

$str="hello world"; //Define string
$result=strspn($str,"khlleo"); //Search for the length that meets the conditions
echo $result;                        // Output the length of the result, return 5

/*
*/

$str="hello world! ???"; //Define string
echo $str."
"; //Output the original string
echo convert_cyr_string($str,'w','a'); //Output the converted string "hello world! ?.?"