How to replace spaces in string in php

How to replace spaces in a string in php: You can use the str_replace() function to replace, the specific usage is: [str_replace('　',' ',$str)]. This function replaces some characters in a string (case-sensitive) and returns a string or array with the replacement values.

Function introduction:

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str_replace( ) function replaces some characters in a string (case-sensitive) and returns a string or array with the replacement values.

Function syntax:

str_replace(find,replace,string,count)

Parameter description:

• 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. A variable counting the number of substitutions.

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Code implementation:

Replace the spaces in the string with comma.

<?php
    /* *
        关键词中的空格替换为逗号
    */
    function emptyreplace($str){
        $str = str_replace(&#39;　&#39;,&#39; &#39;,$str);  //..替换全角空格为半角空格
        $str = str_replace(&#39; &#39;,&#39; &#39;,$str);   //..替换连续的空格为一个
        $noe = false;                 //   是否遇到不是空格的字符
        for($i = 0;$i < strlen($str);$i++){    //  遍历整个字符串
            if($noe && $str[$i] == &#39; &#39;){
                $str[$i] = &#39;,&#39;;           //..如果当前这个空格之前出现了不是空格的字符
            }else if($str[$i] != &#39; &#39;){
                $noe = true;            //  当前这个字符不是空格，定义下$noe变量
            }
        }       
        return $str; 
    }
    echo emptyreplace(&#39;1　前面是一个全角空格     前面是一系列半角空格&#39;);
?>

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