what is the replace function in php

The replacement function in php is "str_replace". This function is used to replace some characters in a string with other characters. Its usage syntax is "str_replace(find,replace,string,count)".

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

What is the replacement function in php?

str_replace() function replaces some characters in a string with other characters (case sensitive).

This function must follow the following rules:

If the searched string is an array, then it will return an array.

If the searched string is an array, then it will find and replace each element in the array.

If you need to search and replace the array at the same time, and the elements that need to be replaced are less than the number of found elements, then the excess elements will be replaced with empty strings

If the searched is an array, and the replacement is a string, then the replacement string will work on all found values.

Note: This function is case-sensitive. Please use the str_ireplace() function to perform a case-insensitive search.

Note: This function is binary safe.

Syntax

str_replace(find,replace,string,count)

Parameters

find Required. Specifies the value to look for.

replace Required. Specifies the value to replace the value in find.

string Required. Specifies the string to be searched for.

count Optional. Variable counting the number of substitutions.

Use str_replace() function with array and count variables:

<?php
$arr = array("blue","red","green","yellow");
print_r(str_replace("red","pink",$arr,$i));
echo "替换数：$i";
?>

Running results:

Array ( [0] => blue [1] => pink [2] => green [3] => yellow ) 替换数：1

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