The width example uses string length instead since I know it will always be at the end of the string. Returns the position of where the needle exists relative to the beginning of the haystack string (independent of offset). This is why there is subtraction done when calculating the height. Substr requires the string it will be processing, the starting point, and the LENGTH of the string to capture. It then figures out the starting and ending position of where the delimiter is found. You don't need to use multiple characters like I did, but make sure you have enough characters so it doesn't capture something else in the string. substr (PHP 4, PHP 5, PHP 7, PHP 8) substr Return part of a string Description substr ( string string, int offset, int length null ): string Returns the portion of string specified by the offset and length parameters. It has a wealth of uses within PHP as it allows you to cut up a string easily. The string that this function returns is referred to as the substring. In addition, the function gives you control over both the offset and the length of the string. Then figure out where each delimiter starts and ends. PHP’s substr () function allows you to take a string and only return a portion of it. You can also set them programmatically if you wish. substr() function substr() function in PHP PHP substring function PHP TutorialIn This Tutorial, We will learn about thesubstr() function substr() fun. $width = substr($imageURL, $strPosStart, $strPosEnd) īasically, define your string delimiters. $height = substr($imageURL, $strPosStart, $strPosEnd) $strPosEnd = strpos($imageURL, $secondDelimiter)-$strPosStart $strPosStart = strpos($imageURL, $firstDelimiter)+3 Example: This example describes the comparison of the 2nd string with the 1st string & accordingly it will return true if the substring is present in it otherwise return false. strlen () : It will returns length of string. Here is working code that I used to find the height and width of an image using delimiters, strpos, strlen, and substr. These functions are: strpos (): This function finds the position of the first occurrence of a string inside another string. Some of the answers related to strpos, strlen, and using delimiters are wrong. The solution is to use the strict checking option.There's a lot of good answers here. These string functions work on two different values: STRING and BYTES data types. substrcompare Binary safe comparison of two strings from an offset, up to length characters Description substrcompare ( string haystack, string needle, int offset, int length null, bool caseinsensitive false ): int substrcompare () compares haystack from position offset with needle up to length characters. It is completely correct behaviour, due to PHP's leniency on variable types, but in "real-life" is almost useless. GoogleSQL for Spanner supports string functions. This function returns the portion of the string from the first occurrence of the substring to the end of the string, or FALSE if the substring is not found. Loose checking returns some crazy, counter-intuitive results when used with certain arrays. Getting Started Introduction A simple tutorial Language Reference Basic syntax Types Variables Constants Expressions Operators Control Structures Functions Classes and Objects Namespaces Enumerations Errors Exceptions Fibers Generators Attributes References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Predefined Attributes Context options and parameters Supported Protocols and Wrappers Security Introduction General considerations Installed as CGI binary Installed as an Apache module Session Security Filesystem Security Database Security Error Reporting User Submitted Data Hiding PHP Keeping Current Features HTTP authentication with PHP Cookies Sessions Dealing with XForms Handling file uploads Using remote files Connection handling Persistent Database Connections Command line usage Garbage Collection DTrace Dynamic Tracing Function Reference Affecting PHP's Behaviour Audio Formats Manipulation Authentication Services Command Line Specific Extensions Compression and Archive Extensions Cryptography Extensions Database Extensions Date and Time Related Extensions File System Related Extensions Human Language and Character Encoding Support Image Processing and Generation Mail Related Extensions Mathematical Extensions Non-Text MIME Output Process Control Extensions Other Basic Extensions Other Services Search Engine Extensions Server Specific Extensions Session Extensions Text Processing Variable and Type Related Extensions Web Services Windows Only Extensions XML Manipulation GUI Extensions Keyboard Shortcuts ? This help j Next menu item k Previous menu item g p Previous man page g n Next man page G Scroll to bottom g g Scroll to top g h Goto homepage g s Goto search To replace a string with a substring in PHP, you can use the strreplace () function.
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