[PHP] Read the blog to learn insertion sort

Define the array length variable $len, use the count() function, parameter: array

for loop array, condition: starting from the second one, traverse the array, within the loop

                                      Define the temporary variable $temp, assign the current element

       Loop array, condition: traverse all elements before the current element

Determine the size of the current element and the elements before it, use temporary variables, convert variables

PHP version:

<?<span>php
</span><span>$arr</span>=<span>array</span>(2,3,4,1,5<span>);
</span><span>function</span> insert_sort(<span>$arr</span><span>){
    </span><span>$len</span>=<span>count</span>(<span>$arr</span><span>);
    </span><span>for</span>(<span>$i</span>=1;<span>$i</span><<span>$len</span>;<span>$i</span>++<span>){
        </span><span>$temp</span>=<span>$arr</span>[<span>$i</span><span>];
        </span><span>for</span>(<span>$j</span>=<span>$i</span>-1;<span>$j</span>>=0;<span>$j</span>--<span>){
            </span><span>if</span>(<span>$temp</span><<span>$arr</span>[<span>$j</span><span>]){
                </span><span>$arr</span>[<span>$j</span>+1]=<span>$arr</span>[<span>$j</span><span>];
                </span><span>$arr</span>[<span>$j</span>]=<span>$temp</span><span>;
            }</span><span>else</span><span>{
                </span><span>break</span><span>;
            }
        }
    }
    </span><span>return</span><span>$arr</span><span>;
}
</span><span>$arr</span>=insert_sort(<span>$arr</span><span>);
</span><span>print_r</span>(<span>$arr</span>);

java version:

<span>package</span><span> com.tsh.mthread;

</span><span>public</span><span>class</span><span> Home {

    </span><span>public</span><span>static</span><span>void</span><span> main(String[] args) {
        </span><span>int</span>[] arr=<span>new</span><span>int</span>[]{2,3,4,1,5<span>};
        arr</span>=<span>insert_sort(arr);
        </span><span>for</span>(<span>int</span><span> x:arr){
            System.out.println(x);
        }
        
    }
    </span><span>/**</span><span>     * 插入排序
     * </span><span>@param</span><span> arr
     * </span><span>@return</span><span>*/</span><span>public</span><span>static</span><span>int</span>[] insert_sort(<span>int</span><span>[] arr) {
        </span><span>int</span> len=<span>arr.length;
        </span><span>for</span>(<span>int</span> i=1;i<len;i++<span>){
            </span><span>int</span> temp=<span>arr[i];
            </span><span>for</span>(<span>int</span> j=i-1;j>=0;j--<span>){
                </span><span>if</span>(temp<<span>arr[j]){
                    arr[j</span>+1]=<span>arr[j];
                    arr[j]</span>=<span>temp;
                }</span><span>else</span><span>{
                    </span><span>break</span><span>;
                }
            }
        }
        </span><span>return</span><span> arr;
    }
}</span>

The above introduces [PHP] Read the blog to learn insertion sort, including insertion sort and PHP content. I hope it will be helpful to friends who are interested in PHP tutorials.