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PHP(2015-10)
============

`strlen()` is one of the most common String functions in PHP. You pass it a string, or variable containing a string, and it returns the number of characters in that string. An example might be:

```
<pre style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(197, 200, 198); border-radius: 2px; padding: 7px 10px; font-size: 15px; line-height: 22px; background-color: rgb(35, 44, 49);">
```
<span class="preprocessor" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(203, 75, 22);"><span class="preprocessor" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);"><?php</span></span>
  <span class="comment" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(150, 152, 150); font-style: italic;"><span class="comment" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">// get the length of a string and</span></span>
  <span class="comment" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(150, 152, 150); font-style: italic;"><span class="comment" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">// print it to the screen</span></span>
  <span class="variable" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(181, 137, 0);"><span class="variable" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">$length</span></span> = strlen(<span class="string" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(181, 189, 104);"><span class="string" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">"david"</span></span>);
  <span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(178, 148, 187);"><span class="keyword" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">print</span></span> <span class="variable" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(181, 137, 0);"><span class="variable" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">$length</span></span>;
<span class="preprocessor" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0); color: rgb(203, 75, 22);"><span class="preprocessor" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);">?></span></span>
```
```

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