If the line contains only spaces?

Question

How can I check if a string contains only spaces?

Answer 1

if (strlen(trim($str)) == 0) 

or if you do not want to include blank lines,

 if (strlen($str) > 0 && strlen(trim($str)) == 0) 

Answer 2

 echo preg_match('/^ *$/', $string) 

Must work.

Answer 3

from: stack overflow

If you want to boost, do it on another answer , not this one!

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This will be the fastest way:

 $str = ' '; if (ctype_space($str)) { } 

Returns false on an empty string because empty is not empty. If you need to include an empty string, you can add || $str == '' || $str == '' This will still lead to faster execution than regular expression or trimming.

ctype_space

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as a function:

 function stringIsNullOrWhitespace($text){ return ctype_space($text) || $text === "" || $text === null; } 

Answer 4

check if trim () result is longer than 0

Answer 5

Use regex:

 $result = preg_match('/^ *$/', $text); 

If you want to test any spaces, not just spaces:

 $result = preg_match('/^\s*$/', $text); 

Answer 6

I think using regular expressions is redundant, but here's another sol'n:

 preg_match('`^\s*$`', $str) 

Answer 7

another way

 preg_match("/^[[:blank:]]+$/",$str,$match); 

Answer 8

Another way, just for playback

 <?php function is_space_str($str) { for($i=0,$c=strlen($str);$i<$c;$i++) { switch (ord($str{$i})) { case 21: case 9: case 10: case 13: case 0: case 11: case 32: break; default: return false; } } return true; } 

Answer 9

 chop($str) === '' 

That should be enough.

Answer 10

If you are using Ck-editor, you must do this.

 if( strlen(trim($value,' ')) == 0 ){ echo "White space found!" }