如何在PHP中替换/删除字符串中的单词

Question

I've a string like this:

SELECT * FROM `backplanechanneldecoder20141002`  AND  WHERE  Z0 = '1'

I want to remove AND from it. I tried using

$sql_total = str_replace("AND WHERE", "WHERE", $sql_total);
$sql_total = str_replace("AND  WHERE", "WHERE", $sql_total);

but it didn't work.

Answer 1

Looks like there's more than one space in between "AND" and "WHERE". You could deal with this using a regular expression:

$sql_total = preg_replace('/AND\s+WHERE/', 'WHERE', $sql_total);

The \\s+ part of the expression matches one or more space characters.

As mentioned in the comments, it's unclear how you have ended up with this string in the first place. It looks as though you're trying to generate a query string programmatically but haven't dealt correctly with the first/only "WHERE" clause. It would clearly be better to address the cause of this issue, rather than fixing the symptom.