douhan1992 2017-11-02 08:29 采纳率: 100%
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如何在PHP中使用开始和结束字符获取字符串的子字符串?

I am looking for finding middle part of a string using starting tag and ending tag in PHP.

$str = 'Abc/hello@gmail.com/1267890(A-29)';
$agcodedup = substr($str, '(', -1);
$agcode = substr($agcodedup, 1);

final expected value of agcode:

$agcode = 'A-29';
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  • dongzhi5386 2017-11-02 08:33
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    You can use preg_match

        $str = 'Abc/hello@gmail.com/1267890(A-29)';
        if(  preg_match('/\(([^)]+)\)/', $string, $match ) ) echo $match[1]."
    
    ";
    

    Outputs

       A-29
    

    You can check it out here

    http://sandbox.onlinephpfunctions.com/code/5b6aa0bf9725b62b87b94edbccc2df1d73450ee4

    Basically Regular expression says:

    • start match, matches \( Open Paren literal
    • capture group ( .. )
    • match everything except [^)]+ Close Paren )
    • end match, matches \) Close Paren literal

    Oh and if you really have your heart set on substr here you go:

    $str = 'Abc/hello@gmail.com/1267890(A-29)';
    
    //this is the location/index of the ( OPEN_PAREN
    //strlen 0 based so we add +1 to offset it
    $start = strpos( $str,'(') +1;
    //this is the location/index of the ) CLOSE_PAREN.
    $end = strpos( $str,')');
    //we need the length of the substring for the third argument, not its index
    $len = ($end-$start);  
    
    echo substr($str, $start, $len );
    

    Ouputs

    A-29
    

    And you can test this here

    http://sandbox.onlinephpfunctions.com/code/88723be11fc82d88316d32a522030b149a4788aa

    If it was me, I would benchmark both methods, and see which is faster.

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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