关联数组用于存储键值对。例如, 要将学生不同学科的分数存储在一个数组中, 数字索引数组将不是最佳选择。取而代之的是, 我们可以使用相应主题的名称作为关联数组中的键, 而值将是它们各自获得的标记。
例子：
【PHP中的关联数组详细介绍】这里
array()
函数用于创建关联数组。
<
?php
/* First method to create an associate array. */
$student_one = array ( "Maths" =>
95, "Physics" =>
90, "Chemistry" =>
96, "English" =>
93, "Computer" =>
98);
/* Second method to create an associate array. */
$student_two [ "Maths" ] = 95;
$student_two [ "Physics" ] = 90;
$student_two [ "Chemistry" ] = 96;
$student_two [ "English" ] = 93;
$student_two [ "Computer" ] = 98;
/* Accessing the elements directly */
echo "Marks for student one is:\n" ;
echo "Maths:" . $student_two [ "Maths" ], "\n" ;
echo "Physics:" . $student_two [ "Physics" ], "\n" ;
echo "Chemistry:" . $student_two [ "Chemistry" ], "\n" ;
echo "English:" . $student_one [ "English" ], "\n" ;
echo "Computer:" . $student_one [ "Computer" ], "\n" ;
?>
输出如下：
Marks for student one is:Maths:95Physics:90Chemistry:96English:93Computer:98遍历关联数组：
我们可以使用循环遍历关联数组。我们可以通过两种方式遍历关联数组。首先通过使用
对于
循环, 其次使用
前言
.
例子：
这里
array_keys()
函数用于查找赋予它们的索引名称, 以及
计数()
函数用于对关联数组中的索引数进行计数。
<
?php /* Creating an associative array */
$student_one = array ( "Maths" =>
95, "Physics" =>
90, "Chemistry" =>
96, "English" =>
93, "Computer" =>
98);
/* Looping through an array using foreach */
echo "Looping using foreach: \n" ;
foreach ( $student_one as $subject =>
$marks ){
echo "Student one got " . $marks . " in " . $subject . "\n" ;
} /* Looping through an array using for */
echo "\nLooping using for: \n" ;
$subject = array_keys ( $student_one );
$marks = count ( $student_one );
for ( $i =0;
$i <
$marks ;
++ $i ) {
echo $subject [ $i ] . ' ' . $student_one [ $subject [ $i ]] . "\n" ;
}
?>
输出如下：
Looping using foreach: Student one got 95 in MathsStudent one got 90 in PhysicsStudent one got 96 in ChemistryStudent one got 93 in EnglishStudent one got 98 in ComputerLooping using for: Maths 95Physics 90Chemistry 96English 93Computer 98创建混合类型的关联数组
<
?php
/* Creating an associative array of mixed types */
$arr [ "xyz" ] = 95;
$arr [100] = "abc" ;
$arr [11.25] = 100;
$arr [ "abc" ] = "pqr" ;
/* Looping through an array using foreach */
foreach ( $arr as $key =>
$val ){
echo $key . "==>
" . $val . "\n" ;
}
?>
输出如下：
xyz==>
95100==>
abc11==>
100abc==>
pqr推荐阅读
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