Position of all characters in the string in php binary n

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Today, when I wrote a function, I used some small and fragmented knowledge points to summarize them in the form of simple examples.

$ Array = array );
$ Ac = array_count_values ($ array); // Number of times all characters in the array appear
Print_r ($ ac );

Echo pow (); // calculate the power 1 of 2

Echo "\ n ";
Echo decbin (1); // converts decimal 1 to binary
Echo "\ n ";
$ L = 4;
$ O = 0;
Echo $ k = sprintf ("% 0 {$ l} d", $ o); // set the length of the string, which is less than the previous zero

Echo "\ n ";

Function getCharpos2 ($ str, $ char) {// This is a function found online. it obtains all the positions of a character in the string and forms an array.

$ J = 0;

$ Arr = array ();

$ Count = substr_count ($ str, $ char );

For ($ I = 0; $ I <$ count; $ I ++ ){

$ J = strpos ($ str, $ char, $ j );

$ Arr [] = $ j;

$ J = $ j + 1;

}

Return $ arr;

}
$ C = getCharpos2 ("10011", '1 ');
Print_r ($ c );

Echo "\ n ";

$ S = 'abcdefg ';
Var_dump (str_split ($ s, 1); separates one character from each other to form an array

$ Array = array ('0', '0', '1 ');

Echo implode ($ array); // combines the array into a string

?>

Output contacts are as follows:

Array
(
[4] => 1
[5] => 1
[1] => 3
[2] => 2
[3] => 1
)
2
1
0000
Array
(
[0] => 0
[1] => 3
[2] => 4
)

Array (7 ){
[0] =>
String (1) ""
[1] =>
String (1) "B"
[2] =>
String (1) "c"
[3] =>
String (1) "d"
[4] =>
String (1) "e"
[5] =>
String (1) "f"
[6] =>
String (1) "g"
}
001

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