PHP Learning Notes-string practice continuation

1. String Split function str_split ($str, length), $str is the string to be cut, length is the split length, the default is 1 if it is a negative number, false

1 $str= ' helloworld! ' ; 2 Print_r (str_split($str, 2)); 3 Echo ' <br> '; 4 Print_r (str_split($str));

Output Result:

Array ([0] = He [1] = ll [2] = = ow [3] = or [4] = ld [5] = =!)
Array ([0] = h [1] = e [2] = + [3] = l [4] = = O [5] = w [6] = o [7] = R [8] = l [9] =& Gt d [Ten] =! )

2. String reversal function Strrev ($STR), returns the string in reverse

$str= ' Hello World '; Echo Strrev ($str);

Output Result: Dlrow Olleh

3.chunk_split ($str, length, $s), divides str into substrings of length lengths and adds the string s later, and finally joins to return the new string

$str= ' language '; Echo Chunk_split ($str, 2, ', ');

Output Result: La,ng,ua,ge,

4. Remove the left character function LTrim ($str, $s)and remove $s from the left side of $str

$str= ' HelloWorld '; $s= ' hello '; Echo LTrim ($str,$s);

Output: World

5. String converted to uppercase function Strtoupper ($STR) and converted to lowercase function strtolower ($str)

$str= ' Hello World '; $str 1=strtoupper($str); Echo $str 1, ' <br> '; $str 2=strtolower($str 1); Echo $str 2;

Output Result:

HELLO World
Hello World

PHP Learning Notes-string practice continuation