PHP Parse error: Invalid body indentation level expecting an indentation level of at least 3 in example. PHP Parse error: Invalid indentation - tabs and spaces cannot be mixed in example. Warning If the closing identifier was found at the start of a line, then regardless of whether it was a part of another word, it may be considered as the closing identifier and causes a ParseError. Warning Prior to PHP 7.
Example 6 Invalid example, prior to PHP 7. Example 7 Valid example, even if prior to PHP 7. My name is "MyName". I am printing some Foo. Now, I am printing some Bar2.
This should print a capital 'A': A. EOD ;? Nowdoc Nowdocs are to single-quoted strings what heredocs are to double-quoted strings. Backslashes are always treated literally, e. Example of string spanning multiple lines using nowdoc syntax.
Variable parsing When a string is specified in double quotes or with heredoc, variables are parsed within it. He drank some apple juice. He drank some juice made of. He drank some juice made of apples. He drank some orange juice.
He drank some purple juice. John Smith drank some apple juice. John Smith then said hello to Jane Smith. John Smith's wife greeted Robert Paulsen. Robert Paulsen greeted the two. The character at index -2 is n. Changing the character at index -3 to o gives strong. Complex curly syntax This isn't called complex because the syntax is complex, but because it allows for the use of complex expressions. Warning Writing to an out of range offset pads the string with spaces. Warning Internally, PHP strings are byte arrays.
Useful functions and operators String s may be concatenated using the '. Converting to string A value can be converted to a string using the string cast or the strval function. Details of the String Type The string in PHP is implemented as an array of bytes and an integer indicating the length of the buffer.
This is case of, for instance, substr , strpos , strlen or strcmp. Another way to think of these functions is that operate on memory buffers, i. Other functions are passed the encoding of the string, possibly they also assume a default if no such information is given. This is the case of htmlentities and the majority of the functions in the mbstring extension.
Others use the current locale see setlocale , but operate byte-by-byte. This is the case of strcasecmp , strtoupper and ucfirst. This means they can be used only with single-byte encodings, as long as the encoding is matched by the locale. If it is encoded in UTF-8, the correct result will not be returned and the resulting string may or may not be returned corrupted, depending on the current locale.
Finally, they may just assume the string is using a specific encoding, usually UTF This is the case of most functions in the intl extension and in the PCRE extension in the last case, only when the u modifier is used. I've been a PHP programmer for a decade, and I've always been using the "single-quoted literal" and "period-concatenation" method of string creation.
But I wanted to answer the performance question once and for all, using sufficient numbers of iterations and a modern PHP version.
For my test, I used: php -v PHP 7. Single-quotes are only faster if your string is completely literal with nothing to parse in it and nothing to concatenate , but the margin is very tiny and doesn't matter. So the "highest code performance" style rules are: 1. Always use double-quoted strings for concatenation. But I had to do 1 billion iterations to find a 1. So the only real reason I'd consider using single-quoted strings for my literals is for code cleanliness, to make it super clear that the string is literal.
If you think another method such as sprintf or 'this'. The documentation does not mention, but a closing semicolon at the end of the heredoc is actually interpreted as a real semicolon, and as such, sometimes leads to syntax errors. By definition, zero raised to any power is zero. You can use the complex syntax to put the value of both object properties AND object methods inside a string. For example However, you cannot do this for all values in your namespace.
Constants and static properties require you to break up the string. Something I experienced which no doubt will help someone. String conversion to numbers. Unfortunately, the documentation is not correct. If the string starts with valid numeric data, this will be the value used.
Otherwise, the value will be 0 zero. This is an example PHP string I don't have curly hair though, sorry. In fact, I don't have any hair Yes that's exactly how it is. I am going through the same phase. It's a hard fight. But lots can be done with only the api of processwire. Stick to that first and in the mean time learn php to it. Works for most designers. And yes thanks to this forum with a lot of helping pro coders things are really good here. Sometimes it is best just to try and see but check for weird results e.
That's how I learnt about curly braces. Sometimes I output something and nothing appears, I add curly braces and voila, it works. So, feel free to try. Generally you don't have to use the curly braces.
But if I were you I would focus in understanding the strings first. You need to be a member in order to leave a comment. Sign up for a new account in our community. It's easy! Already have an account? Sign in here.
Share More sharing options Followers 5. Prev 1 2 Next Page 1 of 2. You can navigate to the specified line using the vim text editor by following these instructions. Additionally, more information about this error can be found in this Github post , along with this StackOverflow post.
You can use Markdown to format your question. For more examples see the Markdown Cheatsheet. Log in to Ask a Question. What does "curly braces deprecated" in PHP mean? Linode 2 years, 1 month ago Linode Staff.
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