我创建了这个php文件，输出很奇怪。有人为什么会在php中发生这种情况吗？
<?php
$i=014;
echo $i/2;
?>
输出为6。
这是由于数字基数或其他原因导致的吗？
答案 0 :(得分：0)
以0开头的数字在PHP中被视为八进制数字。这里的 <properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<neo4j.version>3.4.3</neo4j.version>
</properties>
<dependencies>
<dependency>
<groupId>org.neo4j</groupId>
<artifactId>neo4j</artifactId>
<version>${neo4j.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.neo4j.test</groupId>
<artifactId>neo4j-harness</artifactId>
<version>${neo4j.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.graphaware.neo4j</groupId>
<artifactId>recommendation-engine</artifactId>
<version>3.4.0.52.11</version>
</dependency>
<dependency>
<groupId>org.neo4j.driver</groupId>
<artifactId>neo4j-java-driver</artifactId>
<version>1.6.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.graphaware.neo4j</groupId>
<artifactId>common</artifactId>
<version>3.4.3.52</version>
</dependency>
<dependency>
<groupId>com.graphaware.neo4j</groupId>
<artifactId>tests</artifactId>
<version>3.4.3.52</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
<version>2.3.2</version>
</plugin>
<plugin>
<artifactId>maven-shade-plugin</artifactId>
<version>2.4.3</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
</execution>
</executions>
<configuration>
<filters>
<filter>
<artifact>*:*</artifact>
<excludes>
<exclude>META-INF/*.SF</exclude>
<exclude>META-INF/*.DSA</exclude>
<exclude>META-INF/*.RSA</exclude>
</excludes>
</filter>
</filters>
</configuration>
</plugin>
</plugins>
</build>
是八进制数字，等效于十进制数字系统中的014。这就是为什么它显示12作为输出。
octdec函数将八进制转换为十进制。