Web Programming: PHP Common Commands

yaah,. biasa cuma sekadar pengingat,

substr bukannya substring

Description

string substr ( string $string , int $start [, int $length ] )

Returns the portion of string specified by the start and length parameters.

Parameters

string
The input string.
start
If start is non-negative, the returned string will start at the start‘th position in string, counting from zero. For instance, in the string ‘abcdef‘, the character at position 0 is ‘a‘, the character at position 2 is ‘c‘, and so forth.If start is negative, the returned string will start at the start‘th character from the end of string.

If string is less than or equal to start characters long, FALSE will be returned.

Example #1 Using a negative start

<?php
$rest = substr("abcdef", -1);    // returns "f"
$rest = substr("abcdef", -2);    // returns "ef"
$rest = substr("abcdef", -3, 1); // returns "d"
?>
length
If length is given and is positive, the string returned will contain at most length characters beginning from start (depending on the length of string).If length is given and is negative, then that many characters will be omitted from the end of string (after the start position has been calculated when a start is negative). If start denotes a position beyond this truncation, an empty string will be returned.

If length is given and is 0, FALSE or NULL an empty string will be returned.

Example #2 Using a negative length

<?php
$rest = substr("abcdef", 0, -1);  // returns "abcde"
$rest = substr("abcdef", 2, -1);  // returns "cde"
$rest = substr("abcdef", 4, -4);  // returns ""
$rest = substr("abcdef", -3, -1); // returns "de"
?>

Return Values

Returns the extracted part of string or FALSE on failure.

strip_tags bukannya striptags

Description

string strip_tags ( string $str [, string $allowable_tags ] )

This function tries to return a string with all NUL bytes, HTML and PHP tags stripped from a given str. It uses the same tag stripping state machine as the fgetss() function.

Parameters

str
The input string.
allowable_tags
You can use the optional second parameter to specify tags which should not be stripped.

Note: HTML comments and PHP tags are also stripped. This is hardcoded and can not be changed with allowable_tags.

Mudah2an bermanfaat🙂

Source:

php.net, php.net

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