$s = " I'm a C/PHP/Java/C#/Python programmer ";
$s1 = ltrim($s); // "I'm a C/PHP/Java/C#/Python programmer "
$s2 = rtrim($s); // " I'm a C/PHP/Java/C#/Python programmer"
$s3 = trim($s); // "I'm a C/PHP/Java/C#/Python programmer"
echo $s3 . "\n";
$s = " I'm a \nC/PHP/Java/C#/Python \tprogrammer \n ";
$s4 = trim($s1, " \r\n\0\t"); // "I'm a C/PHP/Java/C#/Python programmer"
echo $s4;
/*
run:
I'm a C/PHP/Java/C#/Python programmer
I'm a C/PHP/Java/C#/Python programmer
*/