How to trim text using PHP

问题:

How to trim some word in php? Example like

pid="5" OR pid="3" OR

I want to remove the last OR

回答1:

I suggest using implode() to stick together SQL expressions like that. First build an array of simple expressions, then implode them with OR:

$pids = array('pid = "5"', 'pid = "3"');

$sql_where = implode(' OR ', $pids);

Now $sql_where is the string 'pid = "5" OR pid = "3"'. You don't have to worry about leftover ORs, even when there is only one element in $pids.

Also, an entirely different solution is to append " false" to your SQL string so it will end in "... OR false" which will make it a valid expression.

@RussellDias' answer is the real answer to your question, these are just some alternatives to think about.

回答2:

You can try rtrim:

rtrim — Strip whitespace (or other characters) from the end of a string

$string = "pid='5' OR pid='3' OR";
echo rtrim($string, "OR"); //outputs pid='5' OR pid='3'

回答3:

Using substr to find and remove the ending OR:

$string = "pid='5' OR pid='3' OR";
if(substr($string, -3) == ' OR') {
  $string = substr($string, 0, -3);
}
echo $string;

回答4:

A regular expression would also work:

$str = 'pid="5" OR pid="3" OR';
print preg_replace('/\sOR$/', '', $str);

回答5:

What do you think about this?

$str='pid="5" OR pid="3" OR';    
$new_str=substr($str,0, strlen($str)-3);