PHP str_replace用下划线替换空格

Question

Is there a reason that I'm not seeing, why this doesn't work?

    $string = $someLongUserGeneratedString;
    $replaced = str_replace(' ', '_', $string);
    echo $replaced;

The output still includes spaces... Any ideas would be awesome

Answer 1

I'll suggest that you use this as it will check for both single and multiple occurrence of white space (as suggested by Lucas Green).

$journalName = preg_replace('/\s+/', '_', $journalName);

instead of:

$journalName = str_replace(' ', '_', $journalName);

Answer 2

Try this instead:

$journalName = preg_replace('/\s+/', '_', $journalName);

Explanation: you are most likely seeing whitespace, not just plain spaces (there is a difference).

Answer 3

For one matched character replace, use str_replace :

$string = str_replace(' ', '_', $string);

For all matched character replace, use preg_replace :

$string = preg_replace('/\s+/', '_', $string);

Answer 4

Try this instead:

$journalName = str_replace(' ', '_', $journalName);

to remove white space