How to replace in php (not case sensitive)

Replacement method: 1. Use str_ireplace() to search for a specified value in an array or string and replace it with another value; 2. Use substr_replace() to replace characters of a specified length starting from the specified position; 3. Using array_replace() will replace the value of the first array with the value of the subsequent array.

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

There are many methods in PHP that can be achieved Case-insensitive array or string replacement:

• str_ireplace() function

• substr_replace() function

• array_replace() function
  

#1. Use the str_ireplace() function

str_ireplace() function to replace a string some characters in (not 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 an array needs to be searched and replaced at the same time, and the elements to be replaced are less than the number of found elements, the excess elements will be replaced with empty strings .

• If you search an array and replace only one string, the replacement string will work for all found values.

<?php
$str = &#39;hello,world,Hello,world&#39;;
$replace = &#39;hi&#39;;
$search = &#39;hello&#39;;
echo str_ireplace($search, $replace, $str);
?>

2. Use the substr_replace() function

substr_replace() function to replace part of the string Replaced with another string.

The substr_replace() function is also case-sensitive, because when this function replaces, it is not based on characters (substrings), but based on the position of the characters.

will replace characters of the specified length starting from the specified position.

<?php
$str = &#39;hello,world,hello,world&#39;;
$replace = &#39;hi&#39;;
echo substr_replace($str, $replace, 0,5)."<br>";
echo substr_replace($str, $replace, 6,5)."<br>";
echo substr_replace($str, $replace, 12,5)."<br>";
?>

3. Use array_replace() function

array_replace() function uses the value of the following array to replace the first one array of values.

array_replace() function is also case-sensitive, because when this function replaces, it is not based on characters.

<?php
$arr1=array("red","green");
$arr2=array("blue","yellow");
var_dump(array_replace($arr1,$arr2));
?>

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