PHP entry-level interview questions: Programming questions (1)

PHP Junior Interview Questionsare for programmers with little experience who are just looking for a job. This provides a lot of help for us to go out forinterview,InterviewOfficial meetings often test us, and theinterview questionsplayed a big role at this time.

1. Write a function to retrieve the file extension from a standard URL as efficiently as possible

For example: http:/ /m.sbmmt.com/course.html Need to remove html or .html

Answer one:

function getExt($url){ $arr = parse_url($url); $file = basename($arr['path']); $ext = explode(".",$file); return $ext[1]; }

Answer two:

function getExt($url) { $url = basename($url); $pos1 = strpos($url,"."); $pos2 = strpos($url,"?"); if(strstr($url,"?")){ return substr($url,$pos1 + 1,$pos2 - $pos1 - 1); } else { return substr($url,$pos1); } }

2. In HTML language, the meta tag at the head of the page can be used to output the encoding format of the file. The following is a standard meta statement

Please use PHP language to write a function to change the charset part value in a similar meta tag in a standard HTML page to big5

Please note:

• 　1. Need to process the complete html page, that is, not just this meta statement

• 　2. Ignore the case

• 3. ' and " are interchangeable here

• 4. The quotation marks on both sides of 'Content-Type' can be ignored, but the quotation marks on both sides of 'text/html; charset=gbk' It doesn’t work

• 5. Pay attention to dealing with extra spaces

3. Write a function to calculate the relative relationship between the two files Path

For example,

$a = '/a/b/c/d/e.php'; $b = '/a/b/12/34/c.php';

calculates that the relative path of $b relative to $a should be ../../c/d and add () to

Answer:

function getRelativePath($a, $b) { $returnPath = array(dirname($b)); $arrA = explode('/', $a); $arrB = explode('/', $returnPath[0]); for ($n = 1, $len = count($arrB); $n < $len; $n++) { if ($arrA[$n] != $arrB[$n]) { break; } } if ($len - $n > 0) { $returnPath = array_merge($returnPath, array_fill(1, $len - $n, '..')); } $returnPath = array_merge($returnPath, array_slice($arrA, $n)); return implode('/', $returnPath); } echo getRelativePath($a, $b);

4. Write a function that can traverse all files and subfolders in a folder.

Answer:

function my_scandir($dir) { $files = array(); if ( $handle = opendir($dir) ) { while ( ($file = readdir($handle)) !== false ) { if ( $file != ".." && $file != "." ) { if ( is_dir($dir . "/" . $file) ) { $files[$file] = scandir($dir . "/" . $file); }else { $files[] = $file; } } } closedir($handle); return $files; } }

Don’t worry after reading the above interview questions. There are other interview questions. It is best to consolidate the basic things to help us interview and find a job.

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