How to replace the specified string in php

In PHP, you can use the substr_replace() function to replace the specified number of characters in the string. The syntax is "substr_replace(string, replacement value, $start, 1)"; among them, the parameter "$ start" specifies the position where the replacement starts, which can be a negative value.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php replaces the specified number Several strings

In PHP, you can use the substr_replace() function to replace characters at specified positions in the string.

<?php
$str = &#39;abcdef&#39;;
echo substr_replace($str, "A", 0,1)."<br>";
echo substr_replace($str, "B", 1,1)."<br>";
echo substr_replace($str, "C", 2,1)."<br>";
echo substr_replace($str, "D", 3,1)."<br>";
echo substr_replace($str, "E", 4,1)."<br>";
echo substr_replace($str, "F", 5,1)."<br>";
?>

Description:

substr_replace() function replaces part of a string with another string.

Syntax:

substr_replace($string,$replacement,$start,$length)

substr_replace() Replaces the substring qualified by the start and optional length parameters in a copy of string string using replacement.

If start is a positive number, replacement will start from the start position of string. If start is negative, the replacement will start at the start position from the bottom of string.

If the length parameter is set and is a positive number, it represents the length of the replaced substring in string. If set to a negative number, it represents the number of characters from the end of the substring to be replaced from the end of string. If this parameter is not provided, the default is strlen(string) (the length of the string). Of course, if length is 0, then the function of this function is to insert replacement at the start position of string.

<?php
$str = &#39;hello !&#39;;
$replace = &#39;world&#39;;
echo substr_replace($str, $replace, 6,1)."<br>";
echo substr_replace($str, $replace, -1,1)."<br>";
?>

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