php foreach/for loop jump problem_PHP tutorial

In PHP, for loop and foreach are two commonly used functions. for is used for large numbers, while foreach is generally used for array traversal.

The code is as follows

代码如下	复制代码
//php当前循环为1，循环由里到外依次递增，break默认为1，例如跳出第2层循环 for ($i=0;$i<3;$i++){ foreach (array(1,2,3) as $val){ foreach (array(1,2,3) as $val){ echo "1层循环 ";              break 2;  //跳出第2层循环                 }         echo "2层循环 ";     }     echo "3层循环 "; } //结果： //1层循环 //3层循环 //1层循环 //3层循环 //1层循环 //3层循环

Copy code

//The current loop of php is 1, and the loop increases from the inside to the outside. The default break is 1, for example, jumping out of the second layer of the loop
for ($i=0;$i<3;$i++){
foreach (array(1,2,3) as $val){
foreach (array(1,2,3) as $val){                                                                          echo "1 layer loop
";
                                                                                                                                                                                break 2;                                }
             echo "2-layer loop
";
}
echo "3-layer loop
";
}
//Result:
//1 layer loop
//3-layer loop
//1 layer loop
//3-layer loop
//1 layer loop
//3-layer loop

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TechArticleIn PHP, for loop and foreach are two commonly used functions. for is used for large numbers, and foreach Generally used in array traversal. The code is as follows Copy code //php current loop is 1, the loop is...