PHP gets the reverse order of a string according to the requirements_PHP tutorial

php gets the reverse order of the string according to the requirements

/**
* Get the reverse order of the string according to the requirements
*/

$s = 'abcdefghijklmnopq';
function Reverse_order($str,$start = null,$end = null)
{

$string = '';
$string1 = '';
$string2 = '';
if ($start === null or $end == = null)
{
for ($i = 0; ($char = $str{$i}) !== '';$i++)
{
$string = $char. $string;
}
          //var_dump($string);
                                                                                                                                                             $end !== null) //Convert the user input as a numeric string into an integer
{
//If it is a letter or Chinese character, $start $end will be 0
after conversion $start = ( int)($start);
                                                                                                                                                                   ,,,, 256);
                 return false; " :) ''; $k++)
                                                                                                                                                                                                                                                                        end))
{
trigger_error("Please enter a number",512);
return false;
}*/
return $string1.$string.$string2;
}
$start = 0;
var_dump(
Reverse_order($s,$start,10),
Reverse_order($s,5,15),
Reverse_order($s,'10 ','15'),
//Reverse_order($s,'-5','15'), //A negative string is converted into a negative number
Reverse_order($s,'df', 'sd'),
Reverse_order($s,'','place'), //When strings that are not numbers are converted to integers, they are all zero
Reverse_order($s)
);

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php Get the reverse order of the string as required?php /*** Get the reverse order of the string as required*/ $s = 'abcdefghijklmnopq '; function Reverse_order($str,$start = null,$end = null) { $stri...