php how to make a if str_replace? - php

Question

$str is some value in a foreach.
$str = str_replace('_name_','_title_',$str);
how to make a if str_replace?
I want do the thing if have a str_replace then echo $str, else not, jump the current foreach then to the next. Thanks.

Answer 1

There is a fourth parameter to str_replace() that is set to the number of replacements performed. If nothing was replaced, it's set to 0. Drop a reference variable there, and then check it in your if statement:
foreach ($str_array as $str) {
$str = str_replace('_name_', '_title_', $str, $count);
if ($count > 0) {
echo $str;
}
}

Answer 2

If you need to test whether a string is found within another string, you can like this.
<?php
if(strpos('_name_', $str) === false) {
//String '_name_' is not found
//Do nothing, or you could change this to do something
} else {
//String '_name_' found
//Replacing it with string '_title_'
$str = str_replace('_name_','_title_',$str);
}
?>
http://php.net/manual/en/function.strpos.php
However you shouldn't need to, for this example. If you run str_replace on a string that has nothing to replace, it won't find anything to replace, and will just move on without making any replacements or changes.
Good luck.

Answer 3

I know this is an old question, but it gives me a guideline to solve my own checking problem, so my solution was:
$contn = "<p>String</p><p></p>";
$contn = str_replace("<p></p>","",$contn,$value);
if ($value==0) {
$contn = nl2br($contn);
}
Works perfectly for me.
Hope this is useful to someone else.