duanjunjie0196 2016-08-08 10:10
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从变量中提取第一个数字

I have variables that always start with a number or numbers and need the script to determine where this number ends, now for an example the variable can be like the following:

1234-hello1.jpg

1 hello1.gif

1234hello1.gif

123456 hello1.gif

What I am trying to say is an explode function would not work, and my regex is very poor, I just need to be left with the first number and ignore any other number in the string. I just need to be left with the number(s) in bold.

Thanks in advance...

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  • dpg78570 2016-08-08 10:19
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    $arr = str_split($str);
    for($i = 0; $i < count($arr); ++$i){
       if(!is_numeric($arr[$i])){
           echo "Number ends at index: " . $i;
           break;
       }
    }
    

    You could also put the numbers into an array using $arr[$i] if you so wish. This is probably a lot more readable than using regex.

    You could add logic to allow one decimal point but from the question it seems you only want integers.

    http://sandbox.onlinephpfunctions.com/code/fd21437e8c1502b56572a624cf6e4683cf483a8d - Example of working code

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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