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Strings
PHP Manual

substr_replace

(PHP 4, PHP 5)

substr_replace — Replace text within a portion of a string

说明

mixed substr_replace ( mixed $string , string $replacement , int $start [, int $length ] )

substr_replace() replaces a copy of string delimited by the start and (optionally) length parameters with the string given in replacement .

参数

string

The input string.

replacement

The replacement string.

start

If start is positive, the replacing will begin at the start 'th offset into string .

If start is negative, the replacing will begin at the start 'th character from the end of string .

length

If given and is positive, it represents the length of the portion of string which is to be replaced. If it is negative, it represents the number of characters from the end of string at which to stop replacing. If it is not given, then it will default to strlen( string ); i.e. end the replacing at the end of string . Of course, if length is zero then this function will have the effect of inserting replacement into string at the given start offset.

返回值

The result string is returned. If string is an array then array is returned.

范例

Example#1 substr_replace() example

<?php
$var = 'ABCDEFGH:/MNRPQR/';
echo "Original: $var<hr />\n";

/* These two examples replace all of $var with 'bob'. */
echo substr_replace($var, 'bob', 0) . "<br />\n";
echo substr_replace($var, 'bob', 0, strlen($var)) . "<br />\n";

/* Insert 'bob' right at the beginning of $var. */
echo substr_replace($var, 'bob', 0, 0) . "<br />\n";

/* These next two replace 'MNRPQR' in $var with 'bob'. */
echo substr_replace($var, 'bob', 10, -1) . "<br />\n";
echo substr_replace($var, 'bob', -7, -1) . "<br />\n";

/* Delete 'MNRPQR' from $var. */
echo substr_replace($var, '', 10, -1) . "<br />\n";
?>

注释

Note: 本函数可安全用于二进制对象。

参见

Strings
PHP Manual