特定字母

Question

下面的代码显示数组值显示所有的值存储在一个数组，但我的目标输出只显示与字母T开始值

有人可以帮我把这段代码转换只提取以字母T开头的值？

<?php 
$cars=array("Volvo1","Volvo2","Volvo3","Volvo4","Volvo5","Volvo6", 
      "BMW1","BMW2","BMW3","BMW4","BMW5","BMW"6, 
      "Toyota1","Toyota2","Toyota3","Toyota4","Toyota5","Toyota6"); 
$arrlength=count($cars); 

for($x = 0;$x < $arrlength; $x++) 
    { 
    echo $cars[$x]; 
    echo "<br>"; 
    } 
?> 

Answer 1

你可以尝试这样的事情？

<?php 
     $cars=array("Volvo1","Volvo2","Volvo3","Volvo4","Volvo5","Volvo6","BMW1","BMW2","BMW3","BMW4","BMW5","BMW", "Toyota1","Toyota2","Toyota3","Toyota4","Toyota5","Toyota6"); 
     $arrlength=count($cars); 

     for($x = 0;$x < $arrlength; $x++) 
     { 
      // substr(string, start, length) 
      if(substr($cars[$x], 0, 1) === 'T') 
      { 
       echo $cars[$x]; 
       echo "<br>"; 
      } 

      // or use this 
      // 0 is first character of the string 
      if($cars[$x][0] === 'T') 
      { 
       echo $cars[$x]; 
       echo "<br>"; 
      } 

     } 
?> 

但更好的方法是，而不是使用for循环只使用一个foreach循环，如下图所示，

<?php 
      $cars=array("Volvo1","Volvo2","Volvo3","Volvo4","Volvo5","Volvo6","BMW1","BMW2","BMW3","BMW4","BMW5","BMW", "Toyota1","Toyota2","Toyota3","Toyota4","Toyota5","Toyota6"); 

      foreach($cars as $car) 
      { 
       // substr(string, start, length) 
       if(substr($car, 0, 1) === 'T') 
       { 
        echo $car; 
        echo "<br>"; 
       } 

       // or use this 
       // 0 is first character of the string 
       if($car[0] === 'T') 
       { 
        echo $car; 
        echo "<br>"; 
       } 

      } 
    ?> 

Answer 2

<?php 
$cars=array("Volvo1","Volvo2","Volvo3","Volvo4","Volvo5","Volvo6", 
      "BMW1","BMW2","BMW3","BMW4","BMW5","BMW6", 
      "Toyota1","Toyota2","Toyota3","Toyota4","Toyota5","Toyota6"); 
$arrlength=count($cars); 

$key = "T"; //Or what you want 
for($x = 0;$x < $arrlength; $x++) 
    { 
    if($cars[$x][0]==$key) 
    { 
     echo $cars[$x]; 
     echo "<br>"; 
    } 
    } 
?>