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Detailed explanation of str_replace() function in php

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Mar 18, 2021 pm 04:18 PM

phpstr_replace

The syntax of str_replace():

str_replace mixed $search  ,mixed $replace, mixed $subject [, int &$count  ] ) : mixed

1.search and replace are all strings

<?php

$bodytag = str_replace("%body%", "black", "<body text=&#39;%body%&#39;>");
echo $bodytag; //输出：<body text=&#39;black&#39;>
?>

2. search is an array, replace is a string

<?php

$vowels = array("a", "e", "i", "o", "u", "A", "E", "I", "O", "U");
$onlyconsonants = str_replace($vowels, "", "Hello World of PHP");
echo $onlyconsonants;// 输出： Hll Wrld f PHP
?>

3. search and replace are both arrays

<?php
$phrase  = "You should eat fruits, vegetables, and fiber every day.";
$healthy = array("fruits", "vegetables", "fiber");
$yummy   = array("pizza", "beer", "ice cream");
$newphrase = str_replace($healthy, $yummy, $phrase);
//输出：You should eat pizza, beer, and ice cream every day
?>

4. Contains the third Parameters

<?php
$str = str_replace("ll", "", "good golly miss molly!", $count);
echo $count;// 赋值: 2
?>

ps: search , the first group of replacement will affect the second group, as follows

$search  = array(&#39;A&#39;, &#39;B&#39;, &#39;C&#39;, &#39;D&#39;, &#39;E&#39;);
$replace = array(&#39;B&#39;, &#39;C&#39;, &#39;D&#39;, &#39;E&#39;, &#39;F&#39;);
$subject = &#39;A&#39;;
echo str_replace($search, $replace, $subject)."<br/>";
// 输出 F ，因为 A 被 B 替换，B 又被 C 替换，以此类推...
// 由于从左到右依次替换，最终 E 被 F 替换

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