PHP returns a string function composed of array elements implode ()

Instance

Combine array elements into a single string:

<?php$arr = Array (' Hello ', ' world! ', ' Beautiful ', ' day! '); echo Implode ("", $arr);? >

Definition and usage

The implode () function returns a string that is composed of array elements.

Note: the implode () function accepts two parameter orders. However, for historical reasons, explode () is not possible, and you must ensure that the separator parameter precedes the string parameter.

Note: The separator parameter of the implode () function is optional. However, for backwards compatibility, it is recommended that you use two parameters.

Note: This function is binary safe.

Grammar

Implode (Separator,array)

Parameter description

Separator is optional. Specifies what is placed between the elements of the array. The default is "" (an empty string).

Array required. An array to combine as a string.

Technical details

Return value: Returns a String that is composed of array elements.

PHP version: 4+

Update log: In PHP 4.3.0, the separator parameter becomes optional.

More examples

Example 1

To separate array elements with different characters:

<?php$arr = Array (' Hello ', ' world! ', ' Beautiful ', ' day! '); echo Implode ("", $arr). " <br> "; Echo implode (" + ", $arr)." <br> "; Echo implode ("-", $arr)." <br> "; echo Implode ("X", $arr);? >

PHP Implode function Application

Sql:

$SQL = "Delete from ' doing ' where ID in (' 1,2,3,4 ')";

Data is separated by commas.

Form:

<form action= "? action=doing" method= "POST" ><input name= "id_dele[" "type=" checkbox "id=" id_dele[] "value=" 1 " /><input name= "id_dele[]" type= "checkbox" id= "id_dele[]" value= "2"/><input name= "id_dele[]" type= " CheckBox "Id=" id_dele[] "value=" 3 "/><input name=" id_dele[] "type=" checkbox "id=" id_dele[] "value=" 4 "/>< Input type= "Submit"/></form>

Good $id_dele=$_post[' Id_dele ' will be an array, although PHP is a weak type, but there is no ASP weak. ASP can directly:
Sql= "Delete from [doing] where ID in ('" &ID_Dele& ') "is deleted. But PHP can't put $id_dele directly in. Because $id_dele is not ' 1,2,3,4 ' Oh, because $id_dele is an array with keys and values.
Well, PHP is not difficult, just have a function: implode (), right. A function opposite to the split () \explode () function, which is split with a character (such as a comma), while the former can be stitched together as a string.

So:

$ID _dele= implode (",", $_post[' Id_dele '); $SQL = "Delete from ' doing ' where ID in ($ID _dele)";