ltrim(), rtrim() and trim() Trimming the string

$text= " This is my text";
echo $text;
$text=ltrim($text);
echo $text;

$text= "This is my text ";
echo $text;
$text=rtrim($text);
echo $text;

$text= " This string has blank space at both sides    ";
echo $text;
$text=trim($text);
echo $text;

$str=' Hello +';
echo rtrim($str,'+');

$str=' Hello Welcome';
echo rtrim($str,'come');

Hello Wel

Remove blank space present inside a string

$new_string=str_replace(' ','',$string);
echo $new_string;

Searching for presence of white space.

$string='ABCD  XYZ';
if (strstr($string,' ')) {
echo " Blank space is  present  ";
}else{
echo " Blank space is NOT  present ";
}