为什么我的PHP echo（）命令不能按预期工作？

我调用一个我知道子字符串存在的函数，而echo命令将无法按我希望的方式工作

它似乎总是呼应字符串说它不存在。对于本例，我们可以将其设置为键

$KEY = "R1*PFD1V1FE1VS1BF1SP1NL2OW1TP1MSD1NR1";

function displayNL( $KEY ) {

    switch ( true ) {
        case ( is_numeric( strpos($KEY, 'NL1') ) ) :
            echo "Masthead Light: May replace with Electric Torch or Lantern    Sidelights: May replace with Electric Torch or Lantern  Sternlight: May replace with Electric Torch or Lantern  Other Lights: -   Dayshapes: - ";
            break;
        case ( is_numeric ( strpos($KEY, 'NL2') ) ) :
            echo "Masthead Light: May replace with Electric Torch or Lantern    Sidelights: May replace with Electric Torch or Lantern   Sternlight: May replace with Electric Torch or Lantern Other Lights: All Around Red over All Around Green on Masthead (OPTIONAL)   Dayshapes: -" ;
            break;
        case ( is_numeric ( strpos($KEY, 'NL3') ) ) :
            echo "Masthead Light: May replace with Electric Torch or Lantern    Sidelights: May replace with Electric Torch or Lantern  Sternlight: May replace with Electric Torch or Lantern  Other Lights: All Around Red over All Around Green on Masthead (OPTIONAL)   Dayshapes: When under power and in International Waters, Cone with Apex Down" ;
            break;
        case ( is_numeric ( strpos($KEY, 'NL4') ) ) :
            echo "Masthead Light: May replace with All Around White Light   Sidelights: May forego if impracticle to mount  Sternlight: May replace with Other Lights: All Around White Light - Dayshapes: - " ;
            break;
        case ( is_numeric ( strpos($KEY, 'NL5') ) ) :
            echo "Masthead Light: May replace with All Around White Light   Sidelights: May have Sidelights Combined in Single Lantern on Centerline    Sternlight: May replace with Other Lights: All Around White Light   -   Dayshapes: - " ;
            break;
        case ( is_numeric ( strpos($KEY, 'NL6') ) ) :
            echo "Masthead Light: Masthead Light Not Required   Sidelights: May have Single Lantern with Sidelights and Sternlights on Mast Sternlight: May have Single Lantern with Sidelights and Sternlights on Mast Other Lights: All Around Red over All Around Green on Masthead (OPTIONAL)   Dayshapes: - " ;
            break;
        case ( is_numeric ( strpos($KEY, 'NL7') ) ) :
            echo "Masthead Light: Masthead Light Not Required   Sidelights: May have Single Lantern with Sidelights and Sternlights on Mast Sternlight: May have Single Lantern with Sidelights and Sternlights on Mast Other Lights: All Around Red over All Around Green on Masthead (OPTIONAL)   Dayshapes: When under power and in International Waters, Cone with Apex Down " ;
            break;
        case ( is_numeric ( strpos($KEY, 'NL8') ) ) :
            echo "Masthead Light: Required  Sidelights: May have Sidelights Combined in Single Lantern on Centerline    Sternlight: Required    Other Lights: - Dayshapes: - " ;
            break;
        case ( is_numeric ( strpos($KEY, 'NL9') ) ) :
            echo "Masthead Light: Required  Sidelights: Required    Sternlight: Required    Other Lights: - Dayshapes: - " ;
            break;
        case ( is_numeric ( strpos($KEY, 'NL1*0') ) ) :
            echo "Masthead Light: Required  Sidelights: Required    Sternlight: Required    Other Lights: All Around Red over All Around Green on Masthead  Dayshapes: - " ;
            break;
        case ( is_numeric ( strpos($KEY, 'NL1*1') ) ) :
            echo "Masthead Light: Required  Sidelights: Required    Sternlight: Required    Other Lights: All Around Red over All Around Green on Masthead  Dayshapes: When under power, Cone with Apex Down " ;
            break;
        case ( is_numeric ( strpos($KEY, 'NL1*2') ) ) :
            echo "Masthead Light: Required, 2   Sidelights: Required    Sternlight: Required    Other Lights: - Dayshapes: - " ;
            break;
        case ( is_numeric ( strpos($KEY, 'NL1*3') ) ) :
            echo "Masthead Light: Required, 2   Sidelights: Required    Sternlight: Required    Other Lights: All Around Red over All Around Green on Masthead  Dayshapes: - " ;
            break;
        case ( is_numeric ( strpos($KEY, 'NL1*4') ) ) :
            echo "Masthead Light: Required, 2   Sidelights: Required    Sternlight: Required    Other Lights: All Around Red over All Around Green on Masthead  Dayshapes: When under power, Cone with Apex Down " ;
            break;
        default:
            echo "Make sure you selected somthing OR This Combination Does Not Exists ";

    }
}


displayNL( $KEY ) ;

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这对我来说很有效…我想这个bug是在别的地方。如果它没有返回任何内容，则尝试使用die（'break'）调试代码；在此代码块之前。这是可以用来识别bug的最简单的调试方法

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如果骰子不工作，则代码块上方会出现错误。

您的代码正在滥用开关，以获得数组或一组ifs更好的服务。另外，NL1*0永远不会发生，因为它只会被NL1捕获。您的

strpos（'KEY，'NL2'）

返回什么？我会快速检查这是奇怪的代码。无论

开关

的用法如何，

strpos

检查都是错误的，因为您需要在

中对其进行检查==FALSE

是一些数字。它没有返回任何内容。它只是一片空白