Question

如何在多维数组中删除包含一个或多个重复值的数组条目？例如，如果我有：

array (size=4)
 0 => 
    array (size=3)
      'food' => string 'bread' (length=5)
      'color' => string 'white' (length=5)
      'language' => string 'php' (length=3)
  1 => 
    array (size=3)
      'food' => string 'rice' (length=4)
      'color' => string 'purple' (length=6)
      'language' => string 'c#' (length=2)
  2 => 
    array (size=3)
      'food' => string 'pasta' (length=5)
      'color' => string 'red' (length=3)
      'language' => string 'php' (length=3)
  3 => 
    array (size=3)
      'food' => string 'steak' (length=5)
      'color' => string 'yellow' (length=6)
      'language' => string 'ruby' (length=4)

由于数组[2]中有一个php条目，我想删除整个记录，以便我可以拥有

array (size=4)
 0 => 
    array (size=3)
      'food' => string 'bread' (length=5)
      'color' => string 'white' (length=5)
      'language' => string 'php' (length=3)
  1 => 
    array (size=3)
      'food' => string 'rice' (length=4)
      'color' => string 'purple' (length=6)
      'language' => string 'c#' (length=2)
  2 => 
    array (size=3)
      'food' => string 'steak' (length=5)
      'color' => string 'yellow' (length=6)
      'language' => string 'ruby' (length=4)

我试过这段代码：

array_map("unserialize", array_unique(array_map("serialize", $array)));

并且它不起作用。我做错了什么？

Answer 1

由于您的对象都不同（例如，它们都有不同的颜色），array_unique不会减少元素的数量。

相反，按照language属性键入数组元素：这将消除重复的php条目，然后将该关联数组转换回索引数组：

foreach($array as $row) {
    $result[$row['language']] = $row;
}
$result = array_values($result);

Answer 2

使用<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.4.3.RELEASE</version> </parent> <properties> <maven.compiler.source>1.8</maven.compiler.source> <maven.compiler.target>1.8</maven.compiler.target> </properties> <dependencyManagement> <dependencies> <dependency> <groupId>com.amazonaws</groupId> <artifactId>aws-java-sdk-bom</artifactId> <version>1.11.106</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-tomcat</artifactId> <scope>provided</scope> </dependency> <dependency> <groupId>com.amazonaws</groupId> <artifactId>aws-lambda-java-core</artifactId> <version>1.1.0</version> </dependency> <dependency> <groupId>com.amazonaws</groupId> <artifactId>aws-java-sdk-dynamodb</artifactId> </dependency> <dependency> <groupId>com.amazonaws</groupId> <artifactId>aws-lambda-java-events</artifactId> <version>1.3.0</version> </dependency> </dependencies> <build> <pluginManagement> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-shade-plugin</artifactId> <version>2.3</version> <configuration> <createDependencyReducedPom>false</createDependencyReducedPom> </configuration> <executions> <execution> <phase>package</phase> <goals> <goal>shade</goal> </goals> </execution> </executions> </plugin> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </pluginManagement> </build>和array_intersect函数的解决方案（将覆盖所有键的重复项）：

array_merge

输出：

$arr = [
    ['food' => 'bread', 'color' => 'white', 'language' => 'php'],
    ['food' => 'rice', 'color' => 'purple', 'language' => 'c#'],
    ['food' => 'pasta', 'color' => 'red', 'language' => 'php'],
    ['food' => 'steak', 'color' => 'yellow', 'language' => 'ruby']
];

$values = [];  // auxiliary array
foreach ($arr as $k => $a) {
    if (array_intersect($values, $a)){
        unset($arr[$k]);  // removing the whole `entry` if it contains duplicates in any key
    } else {
        $values = array_merge($values, array_values($a));
    }
}

print_r($arr);

在多维数组中删除具有一个或多个重复值的数组条目

2 个答案: