I am trying to learning something about PHP, and I don't know how to do it, something like this:
I have a string:
$text = 'This is your post number [postnumb], This is [postnumb], And this is your post number [postnumb].';
And with PHP I want to change the string [postnumb] to the number of post:
$textchanged = 'This is your post number 1, This is your post number 2, This is your post number 3.';
Any help for me? Thanks.
Using preg_replace(), you can use the 4th argument to limit the replacement to the first occurrence. Combine this with a loop that will run until there are no occurrences remaining, and you can achieve what you're after:
$text = 'This is your post number [postnumb], This is [postnumb], And this is your post number [postnumb].';
$i = 0;
while(true)
{
$prev = $text;
$text = preg_replace('/\[postnumb\]/', ++$i, $text, 1);
if($prev === $text)
{
// There were no changes, exit the loop.
break;
}
}
echo $text; // This is your post number 1, This is 2, And this is your post number 3.
preg_replace accepts a regex pattern, not a string. Regex patterns need a delimiter of your choice on either side of the expression, and special characters like []{}?. need to be escaped with a backslash.str_replace("[postnumb]", 1, $text);
You can't set different numbers for [postnumb] using str_replace() (unless you do it manually for substrings).
preg_replace() should help you for that case, or using different tags for different numbers (like [postnumb2] and [postnumb]).
[postnumb]to equal 3 different values