php array array_filter function and array_slice function

2. /*
3. array_filter() uses the callback function to filter the cells in the array
4. array _filter(array,function)
5. Parameter description: If the custom filter function returns true, the current value of the operated array will be included in the returned result array,
6. and the result will be formed into a new array, if the original array is An associative array, the keys remain unchanged.
7. */
8. function delEmpty($val) {
9. ​​​​if​($val===​ "" || $val === "php") { //When there are null values ​​and php values ​​in the array, change them back to false, that is, remove the ones in the array Empty values ​​and php values ​​
10. return false;
11. return
12. true; }
array
13. (
'A'
14. =>"Java", =>false,                                              =>true,
15.                                                                                                                                                                 'e'e = & gt; null,
16. 'g' = & gt; 0,
17. 'g1' = & gt; '0' ,
18.                                                               array_filter($input_array));
19. print_r(array_filter($input_array
,
20. "delEmpty")); The running result without callback function: can be seen , false, null, and true '' blanks and 0 are filtered out, and the subscript of the array has not changed.
21. There is the result of the callback function:
    2. /**
    3. * array_slice() function takes out a segment from the array
    4. * array_slice(array array, int offset[, int length])
    5. * According to the offset and length parameters specified A sequence in the array array.
    6. * offset represents the starting position, length represents the length of this sequence.
    7. * true key does not change
    8. */  
    9. $input = array("Java", "Php",   
    10.                "C++",  "C#",   
    11.                "Ruby", "Object-c");  
    12.   
    13. $outputA = array_slice($input, 2);      // returns "C++", "C#", "Ruby", "Object-c"  
    14. $outputB = array_slice($input, -2, 1);  // returns "Ruby"  
    15. $outputC = array_slice($input, 1, 3);   // returns "Php", "C++", "C#"  
    16. print_r($outputA);  
    17. print_r($outputB);  
    18. print_r($outputC);  
    19. print_r(array_slice($input, 2, -1, true));  
    20. print_r(array_slice($input, 2, -1));  
    21. ?> 
        
    // 运行后 进行查看结果
    

以上就介绍了 php数组array_filter函数和array_slice函数，包括了方面的内容，希望对PHP教程有兴趣的朋友有所帮助。