PHP - 如果字符串与动态数字匹配，则为if语句

Question

I have a PHP string that looks like this

$string = 'This is day 7 of the task';

The number changes depending on what is happening that week so I am trying to do an if statement to check a number has been set like this

if ($string == 'This is day 7 of the task') {
    echo 'Task day is set to a number';
}

I now want to match it regardless of what the number is, what is my best approach, regex?

Something like this maybe?

$string = 'This is day 7 of the task';
$isAMatch = preg_match("/This is day \(\d)+\ of the task\/", $string);

Answer 1

You can indeed do something like this :

if (preg_match("/^This is day [0-9]+ of the task$/", $string)) {
    echo 'Task day is set to a number';
}

the ^means "starts with" and $ means "ends with". Remove them if your string can contain other char at the start or the end.