PHP - make sure string has no whitespace - php

Question

How can I check if a PHP string contains any white space? I want to check if white space is in there, and then echo back an error message if true
if(strlen($username) == whitespace ){
echo "<center>Your username must not contain any whitespace</center>";

Answer 1

if ( preg_match('/\s/',$username) ) ....

Answer 2

This solution is for the inverse problem: to know if a string contains at least one word.
/**
* Check if a string contains at least one word.
*
* #param string $input_string
* #return boolean
* true if there is at least one word, false otherwise.
*/
function contains_at_least_one_word($input_string) {
foreach (explode(' ', $input_string) as $word) {
if (!empty($word)) {
return true;
}
}
return false;
}
If the function return false there are no words in the $input_string.
So, you can do something like that:
if (!contains_at_least_one_word($my_string)) {
echo $my_string . " doesn't contain any words.";
}

Answer 3

Try this method:
if(strlen(trim($username)) == strlen($username)) {
// some white spaces are there.
}

Answer 4

Try this too :
if (count(explode(' ', $username)) > 1) {
// some white spaces are there.
}

Answer 5

Try this:
if ( preg_match('/\s/',$string) ){
echo "yes $string contain whitespace";
} else {
echo "$string clear no whitespace ";
}

Answer 6

Other Method :
$string = "This string have whitespace";
if( $string !== str_replace(' ','',$string) ){
//Have whitespace
}else{
//dont have whitespace
}

Answer 7

I've found another good function which is working fine for searching some charsets in a string - strpbrk
if (strpbrk($string, ' ') !== false) {
echo "Contain space";
} else {
echo "Doesn't contain space";
}

Answer 8

PHP provides a built-in function ctype_space( string $text ) to check for whitespace characters. However, ctype_space() checks if every character of the string creates a whitespace. In your case, you could make a function similar to the following to check if a string has whitespace characters.
/**
* Checks string for whitespace characters.
*
* #param string $text
* The string to test.
* #return bool
* TRUE if any character creates some sort of whitespace; otherwise, FALSE.
*/
function hasWhitespace( $text )
{
for ( $idx = 0; $idx < strlen( $text ); $idx += 1 )
if ( ctype_space( $text[ $idx ] ) )
return TRUE;
return FALSE;
}